SEX IN LIVING FORMS.

Life, in its great diversity of forms, has ever been a subject of the deepest interest to rational beings. Poets have sung of its joys and sorrows, its brilliant phantasies and harsh realities. Philosophers have spent their lives in vain attempts to solve its mysteries; and some have held and thought that life was nothing more than a stupendous farce, a delusion of the senses. Moralists have sought to impress mankind with the truth that "life is real," and teeming with grave responsibilities. Physiologists have busied themselves in observing the phenomena of life, and learning, therefrom, its laws. The subject is certainly an interesting one, and none could be more worthy of the most careful attention.

Living Beings.—Man possesses life in common with other beings almost infinite in number and variety. The hugest beast that roams the forest or plows the main is no more a living creature than the smallest insect or microscopic animalculum. The "big tree" of California and the tiny blade of grass which waves at its foot are alike imbued with life. All nature teems with life. The practiced eye detects multitudes of living forms at every glance.

The universe of life presents the most marvelous manifestations of the infinite power and wisdom of the Creator to be found in all his works. The student of biology sees life in myriad forms which are unnoticed by the casual observer. The microscope reveals whole worlds of life that were unknown before the discovery of this wonderful aid to human vision,—whole tribes of living organisms, each of which, though insignificant in size, possesses organs as perfect and as useful to it in its sphere as do animals of greater magnitude. Under a powerful magnifying glass, a drop of water from a stagnant pool is found to be peopled with curious animated forms; slime from a damp rock, or a speck of green scum from the surface of a pond, presents a museum of living wonders. Through this instrument the student of nature learns that life in its lowest form is represented by a mere atom of living matter, an insignificant speck of trembling jelly, transparent and structureless, having no organs of locomotion, yet able to move in any direction; no nerves or organs of sense, yet possessing a high degree of sensibility; no mouth, teeth, nor organs of digestion, yet capable of taking food, growing, developing, producing other individuals like itself, becoming aged, infirm, and dying,—such is the life history of a living creature at the lower extreme of the scale of animated being. As we rise higher in the scale, we find similar little atoms of life associated together in a single individual, each doing its proper share of the work necessary to maintain the life of the individual as a whole, yet retaining at the same time its own individual life.

As we ascend to still higher forms, we find this association of minute living creatures resulting in the production of forms of increasing complicity. As the structure of the individual becomes more complex and its functions more varied, the greater is the number of separate, yet associated, organisms to do the work.

In man, at the very summit of the scale of animate existence, we find the most delicate and wonderfully intricate living mechanism of all. In him, as in lower, intermediate forms of life, the life of the individual is but a summary of the lives of all numberless minute organisms of which his body is composed. The individual life is but the aggregate life of all the millions of distinct individuals which are associated together in the human organism.

Animals and Vegetables.—The first classification of living creatures separates them into two great kingdoms, animals and vegetables. Although it is very easy to define the general characteristics of each of these classes, it is impossible to fix upon any single peculiarity which will be applicable in every case. Most vegetable organisms remain stationary, while some possess organs of locomotion, and swim about in the water in a manner much resembling the movements of certain animals. Most vegetables obtain their nutriment from the earth and the air, while animals subsist on living matter. A few plants seem to take organic matter for food, some even catching and killing small insects.

It is found impossible to draw the precise line between animals and vegetables, for the reason just mentioned. The two kingdoms blend so intimately that in some cases it is impossible to tell whether a certain microscopic speck of life is an animal or a vegetable. But since these doubtful creatures are usually so minute that several millions of them can exist in a single drop of water, it is usually of no practical importance whether they are animal or vegetable, or sometimes one and sometimes the other, as they have been supposed to be by some biologists.

All living creatures are organized beings. Most possess a structure and an organism more or less complicated; but some of the lowest forms are merely little masses of a transparent, homogeneous jelly, known as protoplasm. Some of the smallest of these are so minute that one hundred millions of them could occupy the space of a cube one-thousandth of an inch on each side; yet each one runs its course of life as regularly as man himself, performing its proper functions even more perfectly, perhaps.

Life Force.—To every thinking mind the question often recurs, What makes the fragrant flower so different from the dead soil from which it grows? the trilling bird, so vastly superior to the inert atmosphere in which it flies? What subtle power paints the rose, and tunes the merry songster's voice? To explain this mystery, philosophers of olden time supposed the existence of a certain peculiar force which is called life, or vital force, or vitality. This supposition does nothing more than furnish a name for a thing unknown, and the very existence of which may fairly be doubted. In fact, any attempt to find a place for such a force, to understand its origin, or harmonize its existence with that of other well-known forces, is unsuccessful; and the theory of a peculiar vital force, a presiding entity present in every living thing, vanishes into thin air to give place to the more rational view of the most advanced modern scientists, that vital force, so-called, is only a manifestation of the ordinary forces of nature acting through a peculiar arrangement of matter. In other words, life depends, not upon a peculiar force, but upon a peculiar arrangement of matter, or organization. It is simply a peculiar manifestation of the force possessed by atoms exhibited through a peculiar arrangement of atoms and molecules. This arrangement is what is known as organization; and bodies which possess it are known as organized or living bodies. The term life may be understood as referring to the phenomena which result from organization.

That life results from organization, not organization from life, is more consonant with the accepted and established facts of science than the contrary view. We might adduce numerous facts and arguments in support of this view of the nature of life, but will not do so here, as we have considered the subject at some length elsewhere.[1]

1 See "Science and the Bible," pp. 36-46.

Nutrition and reproduction are the two great functions of life, being common not only to all animals, but to both animals and plants, to all classes of living creatures. The object of the first, is the development and maintenance of the individual existence; the second has for its end the production of new individuals, or the preservation of the race. Nutrition is a purely selfish process; reproduction is purely unselfish in its object; though the human species—unlike the lower animals, which, while less intelligent, are far more true to nature—too often pervert its functions to the most grossly selfish ends.

The subject of nutrition is an important one, and well worthy the attention of every person who values life. The general disregard of this subject is undoubtedly the cause of a very large share of the ills to which human flesh is heir; but our limited space forbids its consideration here, and we shall confine our attention to reproduction.

REPRODUCTION.

As before remarked, reproduction is a function common to all animals and to all plants. Every organized being has the power to reproduce itself, or to produce, or aid in producing, other individuals like itself. It is by means of this function that plants and animals increase or multiply.

When we consider the great diversity of characters illustrated in animal and vegetable life, and the infinite variety of conditions and circumstances under which organized creatures exist, it is not surprising that modes of reproduction should also present great diversity both in general character and in detail. We shall find it both interesting and instructive to consider some of the many different modes of reproduction, or generation, observed in different classes of living beings, previous to entering upon the specific study of reproduction in man. Before doing thus, however, let us give brief attention to a theoretical form of generation, which cannot be called reproduction, known as

Spontaneous Generation.—By this term is meant the supposed formation of living creatures directly from dead matter without the intervention of other living organisms. The theory is, in substance, an old one. The ancients supposed that the frogs and other small reptiles so abundant in the vicinity of slimy pools and stagnant marshes, were generated spontaneously from the mud and slime in which they lived. This theory was, of course, abandoned when the natural history of reptiles became known.

For several thousand years the belief was still held that maggots found in decaying meat were produced spontaneously; but it was discovered, centuries ago, that maggots are not formed if the flesh is protected from flies, since they are the larvæ, or young, of a species of this insect. A relic of the ancient belief in spontaneous generation is still found in the supposition that horse-hair snakes, so-called, are really formed from the hairs of horses. This belief is quite common, but science long ago exposed its falsity.

When the microscope was discovered it revealed a whole new world of infinitesimal beings which were at first supposed to be of spontaneous origin; but careful scientific investigation has shown that even these mere specks of life are not independent of parentage. M. Pasteur and, more recently, Prof. Tyndall, with many other distinguished scientists, have demonstrated this fact beyond all reasonable chance for question.

It is, then, an established law that every living organism originates with some previously existing living being or beings.

It may be queried, If it be true that life is but a manifestation of the ordinary forces of matter,—which are common to both dead and living matter,—being dependent upon arrangement, then why may it not be that dead matter may, through the action of molecular laws, and without the intervention of any living existence, assume those peculiar forms of arrangement necessary to constitute life, as supposed by the advocates of the theory in question? It is true that some who recognize the fact that life is the result of organization maintain the doctrine of spontaneous generation; that is, the production of life without any agency other than the recognized forces of nature being brought about simply by a fortuitous combination of atoms. Although this doctrine cannot be said to be inconsistent with the theory of life presented, yet it is by no means a legitimate or necessary result of it; and observation proves its falsity.

The testimony of all nature, as almost universally admitted by scientific men, is that life originated through a creative act by the first Great Cause, who gave to certain bodies the requisite arrangement or organization to enable them to perform certain functions, and delegated to them the power to transmit the same to other matter, and thus to perpetuate life. The Creator alone has the power to originate life. Man, with all his wisdom and attainments, cannot discover the secret of organization. He may become familiar with its phenomena, but he cannot unravel, further, the mystery of life. The power of organizing is possessed only by the lower class of living or organized bodies, those known as vegetable organisms or plants. A grain of wheat, a kernel of corn, a potato, when placed under favorable conditions, takes the inert, lifeless particles of matter which lie about it in the earth and air, and organizes them into living substances like itself.

To man and animals the Creator delegated the power to form their own peculiar structures from the vitalized tissues of plants. Thus, both animal and vegetable life is preserved without the necessity of continued acts of creative power, each plant and each animal possessing the power not only to preserve its own life, but also to aid, at least, in the perpetuation of the species. The record of creation in Genesis harmonizes perfectly with this view, it being represented that God formed (organized or arranged) man, animals, and vegetable productions from the earth.

Simplest Form of Generation.—Deep down beneath the waters of the ocean, covering its bottom in certain localities, is found a curious slime, which, under the microscope, is seen to be composed of minute rounded masses of gelatinous matter, or protoplasm. By watching these little bodies intently for a few minutes, the observer will discover that each is a living creature capable of moving, growing, and assuming a variety of shapes. Continued observation will reveal the fact that these little creatures multiply; and a more careful scrutiny will enable him to see how they increase. Each divides into two equal parts so nearly alike that they cannot be distinguished apart. In this case the process of generation is simply the production of two similar individuals from one.

A small quantity of slime taken from the surface of a stone near the bottom of an old well, or on the seaside, when placed under the microscope, will sometimes be found to contain large numbers of small, round, living bodies. Careful watching will show that they also multiply by division; but before the division occurs, two cells unite to form one by a process called conjugation. Then, by the division of this cell, instead of only two cells, a large number of small cells are formed, each of which may be considered as a bud formed upon the body of the parent cell and then separated from it to become by growth an individual like its parent, and, like it, to produce its kind. In this case, we have new individuals formed by the union of two individuals which are to all appearance entirely similar in every particular.

Sex.—Rising higher in the scale of being, we find that, with rare exceptions, reproduction is the result of the union of two dissimilar elements. These elements do not, in higher organisms, as in lower forms of life, constitute the individuals, but are produced by them; and being unlike, they are produced by special organs, each adapted to the formation of one kind of elements. The two classes of organs usually exist in separate individuals, thus giving rise to distinctions of sex; an individual possessing organs which form one kind of elements being called a male, and one possessing organs for the formation of the other kind of elements, a female. The sexual differences between individuals of the same species are not, however, confined to the sexual organs. In most classes of plants and animals, other sexual differences are very great. In some of the lower orders of animals, and in many species of plants, the male and female individuals are so much unlike that for a long time after they were well known, no sexual relation was discovered.

Hermaphrodism.—An individual possessing both male and female organs of reproduction is called an hermaphrodite. Such a combination is very rare among higher animals; but it is by no means uncommon among plants and the lower forms of animal life. The snail, the oyster, the earth-worm, and the common tape-worm, are examples of true hermaphrodites. So-called human hermaphrodites are usually individuals in whom the sexual organs are abnormally developed so that they resemble those of the opposite sex, though they really have but one sex, which can usually be determined with certainty. Only a very few cases have been observed in which both male and female organs were present.

There is now living in Germany an individual who bears the name of a woman; but learned physicians have decided that the person is as much man as woman, having the organs of both sexes. What is still more curious, this person has the feelings of both sexes, having loved at first a man, and afterward a woman. There have been observed, also, a very few instances of individuals in whom the sexual organs of neither sex were present. It thus appears that a person may be of both sexes or of no sex at all.

Sex in Plants.—To one unacquainted with the mysteries of plant life and growth, the idea of attaching sexuality to plants seems very extraordinary; but the botanist recognizes the fact that the distinctions of sex are as clearly maintained in the vegetable as in the animal kingdom. The sexual organs of the higher orders of plants are flowers. That part of the flower which produces seeds answers to the female; another part, which is incapable of forming seeds, answers to the male. The fertile and sterile flowers are sometimes produced on separate plants. Very frequently, they are produced upon separate parts of the same plant, as in the oak, walnut, and many other forest trees, and Indian corn. In the latter plant, so familiar to every one, the "tassel" contains the male flowers, and the part known as the "silk," with the portion to which it is attached—which becomes the ear—the female or fertile flowers. In a large number of species, the male and female organs are combined in a single flower, making a true hermaphrodite.

Sex in Animals.—As previously remarked, individuals of opposite sex usually differ much more than in the character of their sexual organs only. Among higher animals, the male is usually larger, stronger, and of coarser structure than the female. The same contrast is observed in their mental characters. With lower animals, especially insects, the opposite is often observed. The female spider is many times larger than the male. The male ant is small in size when compared with the female. Nevertheless, in all classes of animals the difference in the structure and the functions of the sexual organs is the chief distinguishing character. These differences are not so great, however, as they might at first appear. The male and female organs of reproduction in man and other animals, which seem so dissimilar, when studied in the light shed upon this subject by the science of embryology, are found to be wonderfully alike in structure, differing far more in appearance than in reality, and being little more than modifications of one general plan. Every organ to be found in the one sex has an analogue in the other which is complete in every particular, corresponding in function, in structure, and usually in position.

Other Sexual Differences.—In this country there is between five and six inches difference in height and about twenty pounds difference in weight between the average man and the average woman, the average man being about five feet, eight inches in height, and weighing one hundred and forty-five pounds; while the average woman is five feet, two or two and one-half inches in height, and weighs one hundred and twenty-five pounds. The relation of the sexes in height and weight varies in degree in different countries, but is never changed. The average height and weight of American men and women is considerably above that of the average human being.

Men and Women Differ in Form.—The differences in form are so marked that it is possible for the skilled anatomist to determine the sex of a human being who has been dead for ages, by an examination of the skeleton alone. In man, the shoulders are broad, the hips narrow, and the limbs nearly straight with the body. In woman, the shoulders are narrow and usually rounded, and set farther back, the collar-bone being longer and less curved, giving the chest greater prominence; while the hips are broad.

The consequence of these differences is that woman is generally less graceful and naturally less skillful in the use of the extremities than man, and hence less fitted for athletic sports and feats requiring great dexterity. A girl throws a stone awkwardly, less from want of practice than from a natural peculiarity of physical structure. A woman walks less gracefully than a man, owing to the greater relative breadth of her hips, requiring a motion of the body together with that of the limbs. In consequence of this peculiarity, a woman is less fitted for walking long distances.

Modern Mania for Female Pedestrianism.—Nothing could be much more inhuman than the exhibitions made in satisfying the mania for female pedestrianism which has recently arisen. Not long since, in walking down one of the principal streets of Boston, we passed, in going a distance of thirty rods, three illuminated placards announcing to the public that in as many different public halls four female pedestrians were exhibiting their walking talents for the gratification of the crowds of bawdy loafers and jockeys who congregated to criticize their several "points," and bet on their walking capacity, as though they were horses on a race-course or hounds on a fox hunt.

3,000 Quarter Miles in 3,000 Quarter Hours.—We visited the halls and ascertained that two of these misguided women were attempting the feat of walking respectively 2,700 and 3,000 quarter miles in an equal number of successive quarter hours. This would require almost incessant exertion for nearly twenty-eight days in one case, and for more than thirty-one days in the other, without at any time a period of unbroken rest longer than ten minutes. Such a procedure, in the light of physiology, is a greater inhumanity than the most merciless Boston teamster would inflict upon his dumb brutes. Why does not Mr. Bergh exercise his function in such cases? We did not wonder that the poor women looked pale and suffering, and trudged along with a limping gait.

A Female Walking Match.—At another hall we found two women engaged in a "walking match." The hall was so crowded with spectators—with very few exceptions of the male sex—that it was with difficulty the narrow track could be kept clear.

The sixty hours for which the walk was to be continued had nearly expired, and the excitement grew more intense each moment. One of the walkers, who was a few miles in advance, strode on at a pace almost marvelous, constantly stimulated to greater efforts by the coarse shouts of the masculine audience, who evidently took the same sort of interest in the proceeding that they would in a dog race or a cock fight. The other was pale and spiritless, and it seemed with difficulty that she dragged herself along to keep upon the track until the last. At times she seemed to be almost fainting, as the result of the long-continued excitement and fatigue; but she managed to keep going until nine minutes before the slow moving clock had measured off the sixty hours, when she became too ill to be longer able to stand, and was carried off the track.

The cheers for the winner were as vigorous as though a rebel fort had been captured, a million people emancipated from slavery, or some great and noble deed of honor or daring had been done; but no one thought of the injury which had been done the contestant. We turned away in disgust.

The ancient Greeks and Romans amused themselves with witnessing the gladiatorial contests of their male slaves; but it was left for civilized America to introduce woman into the "ring" and make her show her paces on the race-course. An ungraceful figure she cuts, and a repulsive spectacle she presents; and worst of all is the havoc which she makes with her health. At the very time that these four female pedestrians were making their disgraceful exhibit in Boston, in another part of the same city lay a helpless invalid who was once as noted a "female walkist" as any of them, made hopelessly ill by the same disregard of the plainest laws of nature.

The Male and the Female Brain.—But there are other important physical differences to which we must call attention. Man possesses a larger brain than woman, but she makes up the deficiency in size by superior fineness in quality. The female brain differs from the masculine organ of mentality in other particulars so marked that one who has given the subject attention can determine with perfect ease the probable sex of the owner of almost any skull which might be presented to him. This difference in the conformation of the skull is undoubtedly due to a difference in mental character, which, in turn, depends upon a difference in cerebral development. Faculties which are generally largely developed in one are usually smaller in the other, and the reverse.

Vital Organs of Man and Woman.—The anatomist also observes an interesting difference in the size of the various vital organs. For example, while a woman has a heart proportionally smaller than the same organ in man, she has a larger liver. Thus, while less well fitted for severe physical exertion by less circulatory power, she has superior excretory powers.

Woman Less Muscular, More Enduring.—This peculiarity of structure is perfectly harmonious with the fact which experience has established so often as to make the matter no longer a question, that woman is less fitted for severe muscular exertion than man, but possesses in a superior degree the quality known as endurance. With a less robust frame, a more delicately organized constitution, she will endure for months what would kill a robust man in as many weeks. More perfect elimination of the wastes of the body secures a higher grade of vitality. On no other hypothesis could we account for the marvelous endurance of the feminine part of the civilized portion of the human race, ground down under the heel of fashion for ages, "stayed," "corseted," "laced," and thereby distorted and deformed in a manner that would be fatal to almost any member of the masculine sex.

A Pathological Difference.—Most physiologists mention another particular in which woman differs materially from man; viz, in naturally employing, in respiration, chiefly the upper part of the lungs, while man breathes chiefly with the lower part of the lungs. For several years we have carefully studied this question, and we have been unable to find any physiological or anatomical reason sufficient to account for this fact, if it be such.

Why a Woman Does not Breathe Like a Man.—It is undoubtedly true that most women do breathe almost exclusively with the upper part of the chest; but whether this is a natural peculiarity, or an acquired, unnatural, and depraved one, is a question which we are decidedly inclined to answer in harmony with the latter supposition, basing our conclusion on the following undeniable facts:—

1. In childhood, and until about the age of puberty, respiration in the boy and the girl is exactly the same.

2. Although there is a change in the mode of respiration in most females, usually soon after the period of puberty, marked by increased intercostal respiration and diminished abdominal or deep respiration, this change can be accounted for on other than physiological grounds.

3. We believe the cause of this modification of respiration is the change in dress which is usually made about that time. The young girl is now becoming a woman, and must acquire the art of lacing, wearing a corset, "stays," and sundry other contrivances by means of which to produce a "fine form" by distorting and destroying all natural grace and beauty in the "form divine."

4. We have met a number of ladies whose good fortune and good sense had delivered them from the distorting influence of corset-wearing and tight-lacing, and we have invariably observed that they are as capable of deep respiration as men, and practice it as naturally.

We are thoroughly convinced that this so-called physiological difference between man and woman is really a pathological rather than a natural difference, and is due to the evils of fashionable dress, which we have exposed at some length in another work exclusively devoted to that subject.[2] In short, we believe that the only reason why women do not, under ordinary circumstances, breathe as do men, is simply because they can not breathe naturally.

2 "Evils of Fashionable Dress, and How to Dress Healthfully."

The Reproductive Elements.—As has been previously observed, in all except the very lowest forms of life, two elements are necessary to the production of a new individual, or a reproduction of the species—a male element and a female element. The special organs by means of which these elements are produced, brought together, and developed into the new individual in a more or less perfect state, are termed sexual organs, as we have already seen. As an introduction to the specific study of the sexual organs in the human species, let us briefly consider the

Sexual Organs of Plants.—As already remarked, flowers are the sexual organs of plants. Nothing is more interesting in the natural world than the wonderful beauty, diversity, and perfect adaptability to various conditions and functions, which we see in the sexual parts of plants. An exceedingly interesting line of study, which has occupied the attention of many naturalists, is the wonderful perfection displayed in the adaptability of the male and female parts of plants to each other. Without burdening the reader with unnecessary technicalities of detail, we will briefly notice the principal parts of vegetable sexual organs as illustrated in flowers.

Complete flowers are made up of four parts, two of which, the stamen and pistil, are essential, while the other two, the calyx and corolla, are accessory.

The calyx is that part which surrounds the flower at its outer and lower part. It varies greatly in form and color, but is most frequently of a green or greenish color.

Just within the calyx is the corolla, which usually forms the most attractive, showy, and beautiful part of the flower. The beautifully colored petals of the rose, geranium, dahlia, and other similar flowers, form their corollas.

Vegetable Husbands.—Within the cup formed by the calyx and corolla are placed the stamens and pistils of the flower, the first being the male organs proper, and the second the female organs of the flower.

The stamen is composed of a stem or filament, at the summit of which are placed two little sacks called the anther, which contain a fine, microscopic dust, the pollen, which contains the male reproductive element of the flower. This part of the plant corresponds to the male organ of reproduction in animals. A stamen has been called, not inaptly, a vegetable husband. Some flowers have many stamens, or vegetable husbands, which reminds us of the custom in Thibet and some other Eastern countries which allows a woman to have several husbands.

Polygamous Flowers.—The great naturalist, Linnæus, whose name was immortalized by his careful study and classification of organized life, made the number of stamens possessed by various flowers the basis of a systematic classification.

For example, a flower having but one stamen was classed as monandria, which means, literally, one husband; one having two stamens was classified as diandria; flowers having a large number of male organs were termed polyandria, or many husbands.

The Female Organ of Flowers.—The pistil occupies the very center of the flower. It produces and contains in a cell, the female element, termed the ovule. It is surmounted by the style and the stigma.

A series of plants in which the sexual organs are not visible to the eye are termed cryptogamia, which means literally, hidden marriages.

As we proceed to study the anatomy of the human sexual apparatus we shall be constantly struck with the remarkable correspondence between animals and vegetables in the structure and functions of the sexual apparatus.

Sexual Organs of Animals.—The male reproductive element is called a spermatozoön or zoösperm. The female element is called an ovum, literally, an egg.

The Spermatozoön.—The male reproductive element of animals is formed by an organ called the testis, or testicle, of which each male possesses two. They are elastic, glandular bodies, and are formed within the cavity of the abdomen, near the kidneys, but usually pass out of the abdominal cavity and descend to their permanent position before birth. The opening in the abdominal wall is usually completely closed in a short time; but occasionally it remains open, giving rise to congenital hernia, an accident in which a loop of intestine follows the testicle down into the scrotum, either completely or partially. In a few animals, as in the porcupine, the opening is never fully closed, and the testis remains in the cavity of the body most of the time, passing out only at certain periods. We also occasionally meet cases of human beings in which the testes have never descended from their place in the abdominal cavity, giving the individuals the appearance of eunuchs. This condition, however, though an abnormal one, does not in any way interfere with the function of the organs, as those who happen to possess it often imagine. We have also met with cases in which the organs were movable, and could readily be pressed up into the abdominal cavity, through the unclosed inguinal cavity, which afforded them a passage downward in the process of development.

As before remarked, these peculiarities do not affect the functions of the organs in any appreciable degree, although they not infrequently give rise to some apprehension on the part of those subject to them. The left testicle is sometimes a little smaller than the right, another fact which is seized upon by quacks as a means of exciting the fears of young men who have been addicted to bad habits, although the peculiarity is generally without important significance.

The testicles are connected with the urinary passage by means of two ducts which terminate near the base of the bladder, at which point they connect with the urethra. We need not dwell at further length upon the structure of the testicles, as this subject receives fuller attention elsewhere.

Human spermatozoa are about 1/600 of an inch in length. Those of reptiles are very much larger. One of the remarkable features of these minute elements is their peculiar movements. While alive, the filamentous tail is in constant action in a manner strongly resembling the movements of the caudal appendage of a tadpole. This wonderful property led the earlier observers to believe that they were true animalcula. But they are not to be regarded as such, though one can scarcely make himself believe otherwise while watching their lively evolutions, and apparent volitionary movement from one point to another.

Spermatozoa originate in the testis as cells, which are filled with granules. After a time, each granule acquires a long appendage, and then the cell has become converted into a bundle of small zoösperms. Development still continues, until finally the thin pellicle on the outside of the bundle is ruptured, thus liberating the young spermatozoa, which speedily complete their full development. The spermatozoön is pure protoplasm, which is the basis of all life, and its power of spontaneous motion is due to this fact.

In man, the formation of spermatozoa continues with greater or less rapidity from puberty to old age, though at the two extremes of existence they are imperfectly developed. When not discharged from the body, they are said to be absorbed. Some physiologists claim that they are composed of a substance identical with nerve tissue, and that by absorption they play a very important part in the development and maintenance of the nervous system.

It is asserted by good authorities that the reproductive element in man is not so well developed as to be really fit for the reproduction of the species before the age of twenty-four or twenty-five. After the age of forty-five or fifty, the reproductive elements deteriorate in quality, and become again unfitted for vigorous procreation.

The fully developed zoösperms are suspended in a transparent, gelatinous fluid, which, mingled with the secretion of the prostate gland and other fluids which it meets during its expulsion from the body, constitutes the semen.

The Ovum.—The female element of generation, the ovum, is produced by an organ called the ovary, of which there are two in each individual. In size and form, the ovary closely resembles the testicle. Like the latter organ, also, it is formed within the body early in the process of development; but instead of passing outward and downward, as does the testicle, it remains within the abdominal cavity, suspended in place by ligaments. It is connected with a duct which receives the ovum as it is discharged, and conveys it to the uterus.

The human ovum varies in size from 1/240 to 1/120 of an inch in diameter, and consists of a single cell. Ova are not formed in such large numbers as zoösperms. As a general rule, in the human female, a single ovum is developed and discharged once in about four weeks, during the period of sexual activity.

Fecundation.—It is often asked, and the question has elicited some discussion, Which is the principal reproductive element; the zoösperm, or the ovum? The ancients supposed the male element to be the essential element, being simply nourished and developed by the female; but modern research in biological science does not sustain this view. Probably neither one enjoys especial preëminence; for neither can undergo complete development without the other. In very rare cases, the ovum has been observed to undergo a certain amount of development of itself; but a perfect individual can be produced only by the union of the two kinds of elements, which process is known as fecundation. The instant this union occurs, the life of a new individual begins. All the changes which result between that moment and the birth of the individual are those of development only. Indeed, the same existence continues from the instant of the union of the two elements, not only until birth, but through growth, the attainment of maturity, the decline of life, and even until death.

It is interesting to observe the different methods by which fecundation is effected, both in plants and animals, for this is a process common to both.

Fecundation in Flowers.—The great naturalist, Linnæus, was the first to explain the reproductive process in plants. He tells us that "the flower forms the theater of their amours; the calyx is to be considered as the nuptial bed; the corolla constitutes the curtains; the anthers are the testes; the pollen, the fecundating fluid; the stigma of the pistil, the external genital aperture; the style, the vagina, or the conductor of the prolific seed; the ovary of the plant, the womb; the reciprocal action of the stamens on the pistil, the accessory process of fecundation."

Thus marvelous is the analogy between the reproductive organs and their functions in plants and animals. Through this one vital process we may trace a close relation between all the forms of life, from the humblest plant, or even the mere specks of life which form the green scum upon a stagnant pool, to man, the masterpiece of creation, the highest of all animated creatures. In all the realm of Nature there can be found no more remarkable evidences of the infinite skill and wisdom of the Creator of all things.

In many instances the action of plants seems almost to be prompted by intelligence. At the proper moment, the corolla contracts in such a way as to bring the stamens nearer to the stigma, or in contact with it, so as to insure fecundation. In some aquatic plants the flowers elevate themselves above the surface of water while the process of fecundation is effected; submerging themselves again immediately afterward.

Other very curious changes occur in flowers of different species during the reproductive act. The stigma is observed to become moistened, and even to become distinctly odorous. Often, too, it becomes intensely congested with the juices of the plant, and sometimes even acquires an uncommon and most remarkable degree of contractility. This is the case with the stigma of the tulip and one variety of sensitive plant, and is in these plants observed to occur not only after the application of the pollen to the stigma, but when excited by any other means of stimulation. The flowers of some plants, during and after fecundation, also show an increase of heat, in some cases so marked as to be readily detected with the thermometer. This is said to be the case with the arum of Italy.

In some plants in which the pistil is longer than the stamens, thus elevating the stigma above the anthers, the female organ is often observed to bend over and depress itself so as to come within reach of the anthers.

In most instances the fecundation of flowers is chiefly effected through a purely mechanical process, though in these cases also we see a wonderful adaptation of parts to conditions.

When the male and female parts of flowers are situated on different plants, as is the case in the willow, the poplar, the melon vine, and many other species, the pollen of the male flower is wafted by the wind or gentle breeze to the stigma of the female flower, which will usually be found at no very great distance, although fertilization may take place in this way at very considerable distances. Bees, moths, and many other species of insects, serve a very important purpose in this work, transporting the fertilizing dust upon their wings, antennæ, sucking-tubes, and feet. Small birds, and even the humble snail, which would scarcely be credited with any useful function, are also very serviceable in the same direction. The part performed by insects in the reproductive process of many plants is so great that they have been very poetically termed "the marriage priests of flowers."

Nature provides for thorough fecundation in these cases by placing the plants which bear the male and the female flowers near each other. This fact accounts for the unproductiveness of certain varieties of strawberries unless mixed with plants of some other variety, it being well known to nursery-men that some varieties produce only the female parts of flowers.

Modes of Fecundation in Animals.—The modes by which fecundation is effected in animals are still more various and wonderful than in plants. In some of the lower animals, as in most fish and reptiles, both elements are discharged from the bodies of the parents before coming in contact, there being no contact of the two individuals. In this class of animals the process is almost wholly analogous to fecundation in those plants in which the male and female flowers are on different plants or different parts of the same plant. In the female fish, a large number of ova are developed at a certain season of the year known as the spawning season. Sometimes the number reaches many thousands. At the same time, the testicles of the male fish, which are contained within the abdominal cavity, become distended with developed zoösperms. When the female seeks a place to deposit her eggs, the male closely follows; and as she drops them upon the gravelly bottom, he discharges upon them the zoösperms by which they are fecundated. The process is analogous to some species of frogs. When the female is about to deposit her eggs, the male mounts upon her back and rides about until the eggs are all deposited, discharging upon them the fertilizing spermatozoa as they are laid by the female.

In higher orders of animals, fecundation takes place within the generative organs of the female by contact between the male and the female organs. To effect this, there are necessitated certain accessory organs, the penis in the male and the vagina in the female.

Nothing in all the range of nature is more remarkable than the adaptation of the two varieties of sexual organs in each species. This necessary provision is both a powerful means of securing the perpetuation of the species, and an almost impassable barrier against amalgamation.

The act of union, or sexual congress, is called coitus or copulation. It is accompanied by a peculiar nervous spasm due to excitement of special nerves principally located in the penis in the male, and in an extremely sensitive organ, the clitoris, in the female. The nervous action referred to is more exhausting to the system than any other to which it is subject.

Union of the Ovum and Zoösperm.—The zoösperms not only come in contact with the ovum, but penetrate the thin membrane which incloses its contents, and enter its interior, where they disappear, becoming united with its substance. In the ova of certain fishes, small openings have been observed through which the spermatozoa find entrance. Whether such openings exist in human ova is an undecided question; but it is probable that they do.

Curious Modes of Reproduction.—A peculiar kind of reproduction is observed in a variety of polyp, a curious animal which very much resembles a shrub in appearance. It attaches itself to some solid object, and then, as it grows, sends out little protuberances resembling buds. Some of these separate and fall off, swimming about as separate animals. These never become like the parent polyp; but they lay eggs, which hatch, and become stationary polyps like their grandparent, and in their turn throw off buds to form swimming polyps. In this case we have two kinds of generation combined, alternating with each other.

Plant-lice afford a curious illustration of a similar generation. Males and females unite and produce eggs. The creatures produced by the hatching of eggs are neither males nor perfect females. They are imperfect females. They are all alike, so that no sexual union occurs. Instead of laying eggs, they produce live young like themselves, which appear to be developed from internal buds similar to the external buds of the polyp. After this method of reproduction has continued for eight or ten generations, a few perfect individuals appear, and the first process is repeated.

The common honey-bee affords another illustration like the last. A virgin queen sometimes lays eggs, which always produce males, or drones. After union with a male, she lays eggs in the royal cells which become perfect females like herself. She also seems to have the power to lay, at will, unfecundated eggs, from which drones are produced.

Human Beings Are Developed Buds.—It has been very aptly suggested by an eminent physiologist that the ovum and zoösperm may be correctly considered as internal buds. Thus it would appear that generation is universally a process of budding. A child is but a compound bud, an offshoot from its parents. This idea is not a mere fancy, but has a scientific basis. As all the exquisite details of the most beautiful flower are in essence contained within the tiny bud which first makes its appearance, so is the developed human being, the full-grown man or woman, virtually contained within the tiny cell called the ovum after it has been impregnated or fecundated by the zoösperms. In short, men and women are blossoms in a strictly scientific sense.

Fecundation in Hermaphrodites.—The process of fecundation in hermaphrodite animals is very peculiar. In some cases, as in the snail, the union of two individuals is usually necessary, though each possesses both kinds of organs. In other cases, as in the tape-worm, the oyster, and numerous other mollusks, a single individual has the power to fertilize its own ova, thus being wholly independent. Human hermaphrodites are usually so deformed that fecundation is not effected, which is a fortunate safeguard against the multiplication of such monstrosities.

Development.—After the union of the two elements, known as fecundation or conception, if the conditions are favorable, development occurs, and the little germ is in due process of time developed into an individual which is an exact counterpart of its parents. During this developmental process, the embryonic being is variously treated by different classes of animals.

Unprotected Development.—Most fishes and reptiles discharge their ova before fecundation, or soon after, and pay no further attention to them. The fish deposits its eggs in a little hollow scooped out in the gravelly bed of a stream, or sows them broadcast upon the waters. The turtle buries its eggs in the sand, and leaves them to be hatched by the sun. The ostrich disposes of her eggs in the same way. Many other species of animals pay no regard to the protection of the germs which are destined, if placed under favorable conditions, to become individuals like themselves.

Partial Protection of the Ovum.—There are some exceptions, however, to this general rule among fishes and reptiles. Even fishes manifest a degree of parental solicitude in certain cases. The male of a species of South American fish gathers up the eggs after fecundation has taken place, and carries them in his mouth until they are hatched. Another male fish carries the eggs of his mate in a little pouch upon the lower and posterior part of his body.

Certain species of frogs carry their eggs wound about their legs; others suspend them from the abdomen. Another variety carries its young upon its back. Prof. Wyman describes a "swamp toad" which patiently takes the eggs of his mate, one by one, and fastens them upon her back, observing great regularity in arrangement. These several devices are evidently for the purpose of protecting, in some degree, the young individual during the helpless stage of its existence.

Development in the Higher Animals and Man.—Higher animals are less prolific, and their development is a more complicated process; hence, their young need greater protection, and, for this reason, the ova, instead of being discharged from the body of the female after fecundation, are retained.[3] As we have seen that a suitable receptacle is sometimes provided outside of the body, so now a receptacle is needed, and is provided in the interior of the body of the female. This receptacle is called

3 Curious examples of internal development sometimes occur in animals which usually deposit eggs. Snakes have been known to produce both eggs and living young at the same time. At the annual meeting of the American Society for the Advancement of Science, at Detroit, Mich., in August, 1875, we had the pleasure of examining a specimen, exhibited by Prof. Wilder, of a chick which had undergone a considerable degree of development within the ovary of the hen. It had a head, a rudimentary brain, and internal viscera, but no feathers nor limbs. It was, in fact, an egg hatched before it had been laid. The anomaly excited much interest at that time and since among biologists.

The Uterus.—This is a hollow, pear-shaped organ, located in the median line, just behind the bladder, between it and the rectum. It is supported in place by various ligaments and by the juxtaposition of other organs. Its larger end is directed upward, and communicates upon each side with a very narrow tube which is prolonged outward on either side until it nearly touches the ovary of the same side. Its lower and smaller end fills the internal extremity of the passage previously described as the vagina. When an ovum is matured, it escapes from the ovary into the narrow tube referred to, called the Fallopian tube, and passes down into the cavity of the uterus. If fecundation does not occur, it is expelled or absorbed after six to twelve or fourteen days. If copulation occurs, however, zoösperms are brought into the cavity of the uterus, and, coming in contact with the ovum, fecundate it. This is conception. When the natural process is allowed to proceed, development occurs.

Uterine Gestation.—This is the term applied to the process last referred to. We shall not attempt to describe in detail this most wonderful and intricate of all living processes; but will sketch only the chief points, leaving the reader who would obtain a more complete knowledge of the subject to consult any one of the numerous physiological and obstetrical works which deal with it in a very exhaustive manner.

As soon as the ovum is impregnated by the male element, it begins a process of symmetrical division. The first division produces two cells out of the single one which first existed. By the next division, four segments are produced; then eight, sixteen, etc. While this process is going on, the ovum becomes adherent to the internal wall of the uterus, and is soon enveloped by its mucous membrane, which grows up about and incloses it.

The Primitive Trace.—When the process of segmentation has advanced to a certain point, the cells are aggregated together in a compact layer at the surface. Soon a straight line appears upon this layer, which is called the primitive trace. This delicate line becomes the basis for the spinal column; and upon and about it the whole individual is developed by an intricate process of folding, dividing, and reduplication of the layer of cells. One end of the line becomes the head, and the other becomes the tail. Even man has a caudal appendage at an early stage of his existence. After a further lapse of time, little excrescences, buds, or "pads," appear in the proper positions to represent the arms and legs. After further development the ends split up into fingers and toes, and by the continued development of the parts, perfect arms and legs are formed.

Curious Relation to Lower Animals.—It is a very remarkable fact that in the lower animals we have numerous examples in which the permanent condition of the individual is the same as some one of the stages through which man passes in the process of development. The same author previously quoted makes the following interesting statements:—

"The webbed feet of the seal and ornithorhynchus typify the period when the hands and feet of the human embryo are as yet only partly subdivided into fingers and toes. Indeed, it is not uncommon for the 'web' to persist to some extent between the toes of adults; and occasionally children are born with two or more fingers or toes united to their tips.

"With the seal and the walrus, the limbs are protruded but little beyond the wrist and ankle. With the ordinary quadrupeds, the knee and elbow are visible. The cats, the lemurs, and the monkeys form a series in which the limbs are successively freed from the trunk, and in the highest apes they are capable of nearly the same movements as the human arm and leg, which, in their development, passed through all these stages."

Simplicity of Early Structures.—The first structures formed are exceedingly simple in form. It is only by slow degrees that the great complicity which characterizes many organs is finally attained. For example, the heart is at first only a straight tube. By enlargement and the formation of longitudinal and transverse partitions, the fully developed organ is finally produced. The stomach and intestines are also at first but a simple straight tube. The stomach and large intestine are formed by dilatation; and by a growth of the tube in length while the ends are confined, the small intestines are formed. The other internal organs are successively developed by similar processes.

The Stages of Growth.—At first insignificant in size—a simple cell, the embryonic human being steadily increases in size, gradually approximating more and more closely to the human form, until, at the end of about nine calendar months or ten lunar months, the new individual is prepared to enter the world and begin a more independent course of life. The following condensation of a summary quoted by Dr. Austin Flint, Jr., will give an idea of the size of the developing being at different periods, and the rate of progress:—

At the end of the third week, the embryon is a little less than one-fourth of an inch in length.

At the end of the seventh week, it is three-fourths of an inch long. The liver, lungs, and other internal organs are partially formed.

At the eighth week, it is about one inch in length. It begins to look some like a human being, but it is impossible to determine the sex.

At the third month, the embryon has attained the length of two to two and one-half inches. Its weight is about one ounce.

At the end of the fourth month, the embryon is called a fetus. It is from four to five inches long, and weighs five ounces.

At the fifth month, the fetus is nearly a foot long, and weighs about half a pound.

At the sixth month, the average length of the fetus is about thirteen inches, and its weight one and a half to two pounds. If born, life could continue a few minutes.

At the seventh month, the fetus is from fourteen to fifteen inches long, and weighs two to three pounds. It is now viable (may live if born).

At the eighth month, the length of the fetus is from fifteen to sixteen inches, and its weight from three to four pounds.

At the ninth month, the fetus is about seventeen inches long, and weighs from five to six pounds.

At birth, the infant weighs a little more than seven pounds, the usual range being from four to ten pounds, though these limits are sometimes exceeded.

Duration of Gestation.—The length of time required for the development of a human being is usually reckoned as about forty weeks. A more precise statement places it at about two hundred and seventy-eight days. This limit is often varied from. Cases have occurred in which a much longer time has been required, and numberless cases have occurred in which human beings have been born several weeks before the expiration of the usual time, as stated. There is some uncertainty respecting the exact length of the period of gestation, which grows out of the difficulty of determining, in many cases, the exact time when conception takes place.

Uterine Life.—The uterine life of the new individual begins with the impregnation of the ovum, which occurs the instant it is brought in contact with the zoösperms of the male. While in the uterus, the young life is supported wholly by the mother. She is obliged to provide not only for her own sustenance, but for the maintenance of her child. And she must not only eat for it, but breathe for it as well, since it requires a constant and adequate supply of oxygen before birth as much as afterward.

How the Unborn Infant Breathes.—Oxygen and nutriment are both supplied to it through the medium of an organ called the placenta, which is a spongy growth composed almost entirely of blood-vessels, and is developed upon the inner wall of the uterus, at the point at which the ovum attaches itself after fecundation. The growing fetus is connected with this vascular organ by means of a sort of cable, called the umbilical cord. The cord is almost entirely composed of blood-vessels which convey the blood of the fetus to the placenta and return it again. The fetal blood does not mix with that of the mother, but receives oxygen and nourishment from it by absorption through the thin walls which alone separate it from the mother's blood.

The umbilical cord contains no nerves, as there is no nervous connection between the mother and the child. The only way in which the child can be influenced by the mother is through the medium of the blood, to changes in which it is very susceptible, as we shall see more clearly hereafter.

The cord is attached to the body of the child at the point called the navel, being cut off at birth by the accoucheur. With the placenta, it is expelled soon after the birth of the child, and constitutes the shapeless mass familiarly known as the after-birth, by the retention of which the most serious trouble is occasionally caused.

Parturition.—At the end of the period of development, the young being is forcibly expelled from the laboratory of nature in which it has been formed. In other words, it is born; and this process is termed parturition. Though, at first thought, such an act would seem an utter impossibility, yet it is a very admirable illustration of nature's adaptation of means to ends. During the months of gestation, while the uterus has been enlarging to accommodate its daily increasing contents, the generative passages have also been increasing in size and becoming soft and distensible, so that a seeming impossibility is in due time accomplished without physical damage, though possibly not without intense suffering. However, it is a most gratifying fact that modern medical science may do much to mitigate the pains of childbirth. It is possible, by a proper course of preparation for the expected event, to greatly lessen the suffering usually undergone; and some ladies assert that they have thus avoided real pain altogether. Although the curse pronounced upon the feminine part of the race, in consequence of the sin of Eve, implies suffering in the parturient act, yet there is no doubt that the greater share of the daughters of Eve are, through the perverting and degenerating influences of wrong habits and especially of modern civilization, compelled to suffer many times more than their maternal ancestor. We have sufficient evidence of this in the fact that among barbarian women, who are generally less perverted physically than civilized women, childbirth is regarded with very little apprehension, since it occasions little pain or inconvenience. The same is true of many women among the lower laboring classes. In short, while it is true that more or less suffering must always accompany the parturient act, yet the excessive pain usually attendant upon the process is the result of causes which can in many cases be removed by proper management beforehand and at the time of confinement.

After being relieved of its contents, the uterus and other organs rapidly return to nearly their original size.

Changes in the Child at Birth.—In the system of the child a wonderful change occurs at the moment of its expulsion into the outer world. For the first time, its lungs are filled with air. For the first time they receive the full tide of blood. The whole course of the circulation is changed, and an entirely new process begins. It is surprising in how short a space of time changes so marvelous can be wrought.

Nursing.—The process of development is not fully complete at birth. The young life is not yet prepared to support itself; hence, still further provision is necessary for it. It requires prepared food suited to its condition. This is provided by the mammæ, or breasts, of the female, which are glands for secreting milk. The fully developed gland is peculiar to the female; but a few instances have been known in which it has been sufficiently developed to become functionally active in men, as well as in young girls, though it is usually inactive even in women until near the close of gestation. It is a curious fact that the breasts of a new-born child occasionally contain milk.

The first product of the mammæ is not the proper milk secretion, but is a yellowish fluid called colostrum . The true milk secretion begins two or three days after delivery.

The lacteal secretion is influenced in a very remarkable manner by the mental conditions of the mother. By sudden emotions of grief or anger, it has been known to undergo such changes as to produce in the child a fit of indigestion, vomiting, diarrhea, and even convulsions and death. Any medicine taken by the mother finds its way into the milk, and often affects the delicate system of the infant more than herself. This fact should be a warning to those nursing mothers who use stimulants. Cases are not uncommon in which delicate infants are kept in a state of intoxication for weeks by the use of alcoholic drinks by the mother. The popular notion that lager-beer, ale, wine, or alcohol in any other form, is in any degree necessary or beneficial to a nursing woman is a great error which cannot be too often noticed and condemned. Not only is the mother injured, instead of being benefited by such a practice, but great injury, sometimes life-long in its consequences, is inflicted upon the babe at her breast who takes the intoxicating poison at second hand, and is influenced in a fourfold degree from its feebleness and great susceptibility.

ANATOMY OF THE REPRODUCTIVE ORGANS.

Having now considered the functions and somewhat of the structures of the principal organs of reproduction, we may obtain a more definite idea of the relation of the several organs of each class by a connected review of the anatomy of the parts.

Male Organs.—As previously stated, the external organs of generation in the male are the penis and the testicles, the latter being contained in a pouch called the scrotum. The penis is the organ of urination as well as copulation. Its structure is cellular, and it contains a vast number of minute coils of blood-vessels which become turgid with blood under the influence of sexual excitement, producing distention and erection of the organ. A canal passes through its entire length, called the urethra, which conveys both the urine and the seminal fluid. The organ is protected by a loose covering of integument which folds over the end. This fold is called the foreskin or prepuce.

The fluid formed by each testicle is conveyed by the vas deferens, a curved tube about two feet in length, to the base of the bladder. Here the vas deferens joins with another duct which communicates with an elongated pouch, the vesicula seminalis, which lies close upon the under side of the bladder. The single tube thus formed, the ejaculatory duct, conveys the seminal fluid to the urethra, from which it is discharged.

As the production of seminal fluid is more or less constant in man and some animals, while its discharge is intermittent, the vesiculæ seminales serve as reservoirs for the fluid, preserving it until required, or allowing it to undergo absorption. Some claim that the zoösperms are matured in these organs. They always contain seminal fluid after the age of puberty. During coition, their contents are forcibly expelled by a spasmodic contraction of the muscles which surround them and the ducts leading from them.

The Prostate Gland.—Surrounding the ejaculatory ducts and their openings into the urethra at the base of the bladder is the prostate gland, which produces a peculiar secretion which forms a considerable portion of the seminal fluid, being mingled with the secretion of the testes during its ejaculation. This gland sometimes becomes the seat of somewhat serious disease. In old age it usually becomes somewhat indurated, and often to such an extent as to seriously affect the health and comfort of the individual by interference with urination and by occasioning pain.

Anterior to this organ, in the urethra, is a curious little pouch, the utriculus, which corresponds to the vagina and uterus in the female. Just in front of the prostate gland are two small bodies known as Cowper's glands. They secrete a fluid which combines with the seminal secretion.

Female Organs.—The ovaries, uterus, or womb, Fallopian tubes, and vagina have already been described in part. The external organs of the female are included in the term vulva or pudenda. The most superficial parts are the labia, two thick folds of integument. Just within these are two thinner folds, the labia minora or nymphæ. These, together with the clitoris, situated just above, are extremely sensitive organs, being the chief seat of sexual sense in the female. At the lower part is the opening to the vagina, which in the virgin is usually partially guarded by a thin membrane, the hymen. This is not always a reliable test of virginity, however, as commonly regarded, since it may be destroyed by disease or accident, and may exist even after the occurrence of pregnancy.

The vagina extends from the vulva to the lower end of the uterus, which it incloses, passing between the bladder and the rectum. The lower extremity of the uterus presents a small opening which leads into its interior. Upon either side, at its upper and larger end, is a minute opening, the mouth of the Fallopian tube. The latter organs extend from the uterus outward nearly to the ovaries, toward which they present a number of small filaments, one of which is in contact with each ovary. These filaments, together with the interior of the tubes, are covered with a peculiar kind of cells, upon which are minute cilia, or hairs, in constant motion. Very curiously, they all move in the same direction, toward the cavity of the uterus. When an ovum escapes from the ovary in connection with menstruation, it is by these delicate hairs propelled along a filament of tissue to the Fallopian tube, and thence by the same means is conveyed to the uterus. It may come in contact with the zoösperms at any point between the ovary and the lower orifice of the uterus, and thus undergo fecundation.

Puberty.—For a certain period after birth, the sexual organs remain in a partially developed condition. This period varies in duration with different animals; in some cases being very brief, in others, comprising several years. Upon the attainment of a certain age, the individual becomes sexually perfect, and is then capable of the generative act. This period is called puberty. In man, puberty commonly occurs between the ages of ten and fifteen years, varying considerably in different climates. In this country, and in other countries of about the same latitude, puberty usually occurs at the age of fourteen or fourteen and one-half years in females, and a few months later in males. In cooler climates, as in Norway and Siberia, the change is delayed to the age of eighteen or nineteen years. In tropical climates it is hastened, occurring as early as nine or ten years. In warm climates it is no uncommon thing for a girl to be a mother at twelve; and it is stated that one of the wives of Mahomet was a mother at ten.

Other causes besides climate tend to hasten the occurrence of this change, as habits, temperament, constitutional tendency, education, and idiosyncrasy.

Habits of vigorous physical exercise tend to delay the access of puberty. For this reason, together with others, country boys and girls generally mature later than those living in the city by several months, and even a year or two. Anything that tends to excite the emotions hastens puberty. The excitements of city life, parties, balls, theaters, even the competition of students in school, and the various causes of excitement to the nervous system which occur in city life, have a tendency to hasten the occurrence of the change which awakens the sexual activities of the system into life. Hence, these influences cannot but be considered prejudicial to the best interests of the individual, mentally, morally, and physically, since it is in every way desirable that a change which arouses the passions and gives to them greater intensity should be delayed rather than hastened.

Influence of Diet on Puberty.—The dietary has a not unimportant influence in this respect. Stimulating food, such as pepper, vinegar, mustard, spices, and condiments generally, together with tea and coffee, and an excess of animal food, have a clearly appreciable influence in inducing the premature occurrence of puberty. On this account, if on no other, should these articles be prohibited to children and youth, or used very sparingly. Those who advocate the large use of meat by children and youth have not studied this matter closely in all its bearings. While it is true that children and growing youth require an abundance of the nitrogenous elements of food which are found abundantly in beefsteak, mutton, fish, and other varieties of animal food, it is also true that in taking those articles of food they take along with the nutrient elements properties of a stimulating character, which exert a decidedly detrimental influence upon the susceptible systems of children and youth. At the same time, it is possible to obtain the same desirable nitrogenous elements in oatmeal, unbolted wheat flour, peas, beans, and other vegetable productions, which are wholly free from injurious properties. We are positive from numerous observations on this subject, that a cool, unstimulating, vegetable or farinaceous diet would deter the development of the sexual organism for several months, and perhaps for a year or two.

While it might not be in all cases desirable to do this, it would at least be wise to adopt such measures in cases in which the child is unavoidably exposed to influences which have a tendency to hasten the change.

It is important to add in this connection a word of caution against the adoption of a dietary too abstemious in character. It is necessary that an abundance of good, wholesome food, rich in the elements of nutrition, should be taken regularly. There is no doubt that many young ladies have induced conditions of serious disease by actual starvation of the system. A young woman who attempts to live on strong tea or coffee, fine-flour bread, and sweet cake, is as certainly starving herself as though she were purposely attempting to commit suicide by means of starvation, and with as much certainty of the same result.

Brunettes Naturally Precocious.—It has been observed that in girls the occurrence of puberty is earlier in brunettes than in blondes; and in general it makes its appearance earlier in persons of a nervous or nervo-bilious temperament than in persons of a lymphatic temperament or phlegmatic nature.

Certain nationalities and families are marked by the earlier occurrence of puberty than in others. In Jews, the change is commonly a year or two in advance of other nationalities in this country. It also occurs somewhat sooner in negroes and creoles than in white persons, the African race seeming to retain something of the precocity occasioned by the tropical influence of its native clime.

Remarkable Precocity.—Cases occasionally occur in which puberty makes its appearance at the age of three or four years. Indeed, a case has been reported in this country in which a female child possessed all the characteristics which are usually developed at puberty, from birth. In this case the regular periodical changes began at birth.

Premature Development Occasions Early Decay.—A fact which is of too great importance to allow to pass unnoticed, is that whatever occasions early or premature sexual development, also occasions premature decay. Females in whom puberty occurs at the age of ten or twelve, by the time their age is doubled, are shriveled and wrinkled with age. At the time when they should be in their prime of health and beauty, they are prematurely old and broken. Those women who mature late retain their beauty and their strength many years after their precocious sisters have become old, decrepit, and broken down. Thus, the matrons of thirty and forty years in colder climates are much more attractive in appearance than the maidens of sixteen; while quite the reverse is true in this and other countries where sexual development is unduly hastened.

Early Puberty a Cause for Anxiety.—The unnaturally early appearance of puberty is a just cause for apprehension, since it usually indicates an inherent weakness of the constitution. When there are reasons for fearing its occurrence, active measures should be taken to occasion delay if possible. We call especial attention to this point, since there are many who erroneously suppose the early occurrence of puberty to be a sign of superior vigor.

Changes which Occur at Puberty.—The changes which occur in the two sexes at this period have been thus described:—

"In both sexes, hair grows on the skin covering the symphysis pubis, around the sexual organs, and in the axillæ (armpits). In man, the chest and shoulders broaden, the larynx enlarges, and the voice becomes lower in pitch from the elongation of the vocal cords; hair grows upon the chin, upper lip, and cheeks, and often exists upon the general surface of the body more abundantly than in woman." The sexual organs undergo enlargement, and are more frequently excited. The testicles first begin the secretion of the seminal fluid.

"In woman, the pelvis and abdomen enlarge, but the whole frame remains more slender, the muscles and joints less prominent, the limbs more rounded and tapering [than in the male]. Locally, both external and internal organs undergo a considerable and rapid enlargement. The mammæ enlarge, the ovarian vesicles become dilated, and there is established a periodical discharge of one or more ova, accompanied, in most cases, by a sanguineous fluid from the cavity of the uterus."

These changes, so varied and extraordinary, often occur within a very short space of time; and as they are liable to serious derangement, especially in the female, great care should be taken to secure for the individual the most favorable conditions until they are successfully effected. It is, however, a fact deserving of mention, that many of the ills which are developed at this particular period are quite as much the result of previous indiscretions and mismanagement as of any immediate cause. A few suggestions with regard to the proper treatment of individuals at this age may be in place.

1. Do not allow the boy or girl to be overworked, either mentally or physically. Great and important changes are occurring within the body, and nature should not be overtaxed.

2. Keep the mind occupied. While excessive labor should be avoided, idleness should be as carefully shunned. Some light, useful employment or harmless amusement—better some kind of work—should keep the mind fully occupied with wholesome subjects.

3. Abundant exercise out-of-doors is essential for both sexes. Sunshine and fresh air are as necessary to the development of a human being as for the expanding of a flower bud.

4. Watch carefully the associations of the youth. This should be done at all times, but especially just at the critical period in question, when the general physical disturbances occurring in the system react upon the mind and make it peculiarly susceptible to influences, especially those of an evil character.

5. None too much care can be exercised at this important epoch of human life, provided it is properly applied; but nothing could be more disastrous in its consequences than a weak solicitude which panders to every whim and gratifies every perverted appetite. Such care is a fatal error.

Menstruation.—The functional changes which occur in the female are much more marked than those of the male. As already intimated, the periodical development and discharge of an ovum by the female, which occurs after puberty, is accompanied by the discharge of a bloody fluid, which is known as the flowers, menses, or catamenia. The accompanying symptoms together are termed the process of menstruation, or being unwell. This usually occurs, in the human female, once in about four weeks. In special cases, the interval may be a week less or a week longer; or the variation may be even greater. Dalton describes the process as follows:—

"When the expected period is about to come on, the female is affected by a certain degree of discomfort and lassitude, a sense of weight in the pelvis, and more or less disinclination to society. These symptoms are in some cases slightly pronounced, in others more troublesome. An unusual discharge of vaginal mucus then begins to take place, which soon becomes yellowish or rusty brown in color, from the admixture of a certain proportion of blood; and by the second or third day, the discharge has the appearance of nearly pure blood. The unpleasant sensations which were at first manifest, then usually subside; and the discharge, after continuing for a certain period, begins to grow more scanty. Its color changes from a pure red to a brownish or rusty tinge, until it finally disappears altogether, and the female returns to her ordinary condition."

The menstrual function continues active from puberty to about the forty-fifth year, or during the period of fertility. When it finally disappears, the woman is no longer capable of bearing children. The time of disappearance is termed the "change of life," or menopause. Exceptional cases occur in which this period is greatly hastened, arriving as early as the thirty-fifth year, or even earlier. Instances have also been observed in which menstruation continued as late as the sixtieth year, and even later; but such cases are very rare; and if procreation occurs, the progeny is feeble and senile.

With rare exceptions, the function is suspended during pregnancy, and usually, also, during the period of nursing.

Nature of Menstruation.—There has been a great amount of speculation concerning the cause and nature of the menstrual process. No entirely satisfactory conclusions have been reached, however, except that it is usually accompanied by the maturation and expulsion from the ovary of an ovum, which is termed ovulation. But menstruation may occur without ovulation, and, vice versa.

Menstruation is not peculiar to the human female, being represented in the higher animals by what is familiarly termed the "rut." This is not usually a bloody discharge, however, as in the human female, though such a discharge has been observed in the monkey.

It has been quite satisfactorily settled that the discharge of the ovum from the ovary generally takes place about the time of the cessation of the flow. Immediately after the discharge, the sexual desires of the female are more intense than at other times. This fact is particularly manifest in lower animals. The following remark by Prof. Dalton is especially significant to those who care to appreciate its bearing:—

"It is a remarkable fact, in this connection, that the female of these [domestic] animals will allow the approaches of the male only during and immediately after the oestrual period [rut]; that is, just when the egg is recently discharged, and ready for impregnation. At other times, when sexual intercourse would be necessarily fruitless, the instinct of the animal leads her to avoid it; and the concourse of the sexes is accordingly made to correspond in time with the maturity of the egg and its aptitude for fecundation."

The amount of fluid lost during the menstrual flow varies greatly with different individuals. It is estimated at from three ounces to half a pint. In cases of deranged function, it may be much greater than this. It is not all blood, however, a considerable portion being mucus. It is rather difficult to understand why the discharge of so considerable a quantity of blood is required. There is no benefit derived from a very copious discharge, as some suppose. Facts seem to indicate that in general those enjoy the best health who lose but small quantities of blood in this manner.

A Critical Period.—As the first occurrence of menstruation is a very critical period in the life of a female, and as each recurrence of the function renders her especially susceptible to morbid influences, and liable to serious derangements, a few hints respecting the proper care of an individual at these periods may be acceptable.

Important Hints.—1. Avoid taking cold. To do this, it is necessary to avoid exposure; not that a person must be constantly confined in a warm room, for such a course would be the surest way in which to increase the susceptibility to cold. Nothing will disturb the menstrual process more quickly than a sudden chilling of the body when in a state of perspiration, or after confinement in a warm room, by exposure, without sufficient protection, to cold air. A daily bath and daily exercise in the open air are the best known means of preventing colds.

2. Intense mental excitement, as well as severe physical labor, is to be sedulously avoided during this period. At the time of its first occurrence, special care should be observed in this direction. Intense study, a fit of anger, sudden grief, or even great merriment, will sometimes arrest the process prematurely. The feeling of malaise which usually accompanies the discharge is by nature intended as a warning that rest and quiet are required; and the hint should be followed. Every endeavor should be made to keep the individual comfortable, calm, and cheerful. Feelings of apprehension arising from a continual watching of symptoms are very depressing, and should be avoided by occupying the mind in some agreeable manner not demanding severe effort, either mental or physical.

There is no doubt that many young women have permanently injured their constitutions while at school by excessive mental taxation during the catamenial period, to which they were prompted by ambition to excel, or were compelled by the "cramming" system too generally pursued in our schools, and particularly in young ladies' seminaries. It is not to be supposed, however, that the moderate amount of sound study required by a correct system of teaching would be injurious to a healthy young woman at any time, and we have no doubt that a very large share of the injury which has been attributed to over-study during the catamenia has been induced by other causes, such as improper dress, exposure to taking cold, keeping late hours, and improper diet.

If there is any class of persons deserving of pity it is that large class of girls and young women who are in every large city employed as clerks, seamstresses, flower makers, and in other taxing and confining occupations. In order to keep their situations they are required to be on hand daily, being allowed no opportunity for rest at the menstrual period. In many cases, too, they are compelled to remain upon their feet all day behind a counter, or at a work table, even at periods when a recumbent position is actually demanded by nature. There should be less delicacy in relation to this subject on the part of young women, and more consideration on the part of employers. Here is a field for philanthropic effort which is well worthy of the best efforts of any person of influence who will engage in it.

Custom of Indian Women.—The ease with which Indian women perform the parturient act is proverbial. They suffer scarcely at all from the pains of childbirth; and without doubt one reason of this is the preservation of their sexual health by rest during the menstrual period. At those seasons they invariably absent themselves from the lodge, and enjoy absolute rest. We may readily suppose, from the nature of some of the Mosaic laws, that a custom somewhat similar prevailed among the ancient Hebrew women. If the hardy women of the forest are benefited by rest, certainly our more delicate females may be thus benefited. All need a degree of rest; with some it should be absolute.

The reckless manner in which some young women treat themselves at the menstrual period, is quite appalling to one who is acquainted with the painful and inveterate character of the evils which arise from such abuse. It is no uncommon thing for young ladies to attend balls, visit skating rinks, and otherwise expose themselves to the influences in every way the best calculated to do them the most harm at this particular period, observing not the slightest precaution. Such recklessness is really criminal; and the sad consequences of physical transgression are sure to follow. A young lady who allows herself to get wet or chilled, or gets the feet wet, just prior to or during menstruation, runs the risk of imposing upon herself life-long injury. Mothers should look carefully after their daughters at these periods, and impress upon them the importance of special care.

3. A third hint, which is applicable to both sexes and at all times, is the necessity of attending promptly to the demands of nature for relief of the bowels and bladder. School-girls are often very negligent in this respect; and we have seen the most distressing cases of disease which were entirely attributable to this disregard of the promptings of nature. Obstinate constipation and chronic irritation of the bladder are common effects. When constipation results, purgatives in the shape of pills, salts, or "pleasant purgative pellets," are resorted to with the certain result of producing only temporary relief, and permanent damage.

To escape these evil consequences, do this: 1. Establish a regular habit of relieving the bowels daily at a certain hour; 2. Discard laxative and cathartic drugs of every kind; 3. To aid in securing a regular movement of the bowels, make a liberal use of oatmeal, wheat-meal, fruit, and vegetables, avoiding fine-flour bread, sweetmeats, and condiments; 4. Take daily exercise, as much as possible short of fatigue; if necessarily confined indoors, counteract the constipating influence of sedentary habits by kneading and percussing the bowels with the hands several minutes each day; 5. Never resist the calls of nature a single moment, if possible to avoid it. In this case, as in numerous others, "delay is dangerous." Ladies who desire a sweet breath—and what lady does not—should remember that retained feces are one of the most frequent causes of foul breath. The foul odors which ought to pass out through the bowels find their way into the blood and escape at the lungs. A medical man whose sense of smell is delicate soon learns to know a constipated person by the breath. As one says, "What is more offensive than the breath of a costive child?"

Boerhaave, a famous old Dutch physician, left to his heirs an elegantly bound volume in which, he claimed, were written all the secrets of the science of physic. After his death, the wonderful book was opened, when it was found to contain only the following sentence:—

"Keep the head cool, the feet warm, and the bowels open."

An old Scotch physician once gave the following advice to Sir Astley Cooper for the preservation of health:—

"Keep in the fear of the Lord, and your bowels open."

4. Perhaps nothing tends more directly to the production of menstrual derangements—as well as uterine diseases of every sort—than fashionable modes of dress. We have not space here to give to the subject the attention it deserves; it will be found treated of in works devoted to the subject of dress exclusively. Some of the most glaring evils are,—

(1) Unequal distribution of clothing. The trunk, especially the abdomen and pelvis, is covered with numerous layers of clothing, an extra amount being caused by the overlapping of the upper and lower garments. Very frequently, the amount of clothing upon these, the most vital parts, is excessive. At the same time, the limbs are sometimes almost in a state of nudity. A single cotton garment, or at most one of thin flannel, is the only protection afforded to the limbs beneath the skirts, which often serve no better purpose than to collect cold air and retain it in contact with the limbs. A thin stocking is the only protection for the ankles, and a thin shoe is the only additional covering afforded the feet. Under such circumstances, it is no wonder that a woman catches cold if she only steps out-of-doors on a chilly or damp day.

(2) Another glaring fault is in the manner of suspending the skirts. Instead of being fastened to a waist or suspended so as to give them support from the shoulders, they are hung upon the hips, being drawn tight at the waist to secure support. By this means, the organs of the pelvis are pressed down out of place. The uterus becomes congested, and painful menstrual derangements ensue.

(3) Tight lacing, or compressing the waist with a corset, is a barbarous practice which produces the same results as the one last mentioned. Reform in all of these particulars is an imperative necessity for every woman who desires to secure or retain sexual health.

It is of the greatest importance that careful attention should be given to the proper establishment of the menstrual function at the outset of a woman's life of sexual activity. The first two years will be quite likely to have a deciding influence respecting her health during her whole future life. If a woman can get through the first two years after puberty without acquiring any serious uterine or ovarian disease, she will stand a good chance of enjoying a good degree of sexual health during the balance of her life. The foundation of a great share of the many thousands of cases of uterine disease is laid during this period.

At this early period the daughter is usually too young to appreciate the importance of observing slight deviations from the standard of health, even if she were able to recognize them. Hence it is a duty which no mother should neglect, to inquire into the exact frequency of the periods, the amount and character of the discharge, and other points necessary to ascertain whether or not there is any deviation from the natural condition of health. If there is pain, it is a certain evidence of something seriously wrong. If there is irregularity in any particular, it is a matter well deserving of serious attention.

Menorrhagia.—This condition is that in which there is a too profuse discharge of blood. The system is weakened by the loss, and, so much so, in many cases, that the individual does not recover her accustomed strength before the occurrence of the next period, when she becomes weakened still more. By a continuance of this periodical loss, the person may be reduced to a state of almost utter helplessness. A deathly pallor of the countenance, extreme emaciation, loss of strength, and general debility mark the effects of the constant drain upon the system. Thousands of young women continue to suffer in this way year after year, until their constitutions are almost hopelessly wrecked, being deterred by false notions of modesty or delicacy from consulting a proper medical adviser and finding relief.

The observance of a few simple precautions, and the application of proper remedies, will check the unnatural loss in most of these cases very promptly. In the first place, absolute rest, chiefly in a supine position, must be observed not only during the menstrual period, but for a few days previous to its commencement. If this does not restrain the flow, then cool and even cold compresses may be applied to the lower part of the abdomen and to the small of the back. In severe cases no harm will come from the use of an ice-compress, made by inclosing pounded ice between the folds of a towel. Great care must be taken to make the hands, arms, feet, and limbs thoroughly warm by the application of warm bottles and woolen blankets. These measures will scarcely fail to accomplish the desired end, if employed thoroughly and judiciously. It may be well to add just here that the popular fear of using cold in such cases is groundless. No harm can come so long as the extremities are kept warm, and the circulation well balanced. The patient must not be made chilly, however. It is also of importance that the patient be kept mentally quiet as well as physically so.