Volume 23 — SCIENTIFIC MISCELLANY.

PROTECTION FROM LIGHTNING.

Prof. Clerk Maxwell says that the ordinary lightning rod is a great mistake. It acts to discharge electricity from the clouds at all possible opportunities, but these discharges are smaller than would occur without the rod. The true method is to encase the building in a network of rods, when it will take its charge quietly like a Leyden jar. Taking the case of a powder mill, it would be sufficient to surround it with a conducting material, to sheathe its roof, walls, and ground-floor with thick sheet copper, and then no electrical effect could occur within it on account of any thunderstorm outside. There would be no need of any earth connection. We might even place a layer of asphalte between the copper floor and the ground, so as to insulate the building. If the mill were then struck with lightning, it would remain charged for some time, and a person standing on the ground outside and touching the wall might receive a shock, but no electrical effect would be perceived inside, even on the most delicate electrometer.

This sheathing with sheet copper is not necessary. It is quite sufficient to enclose the building with a network of a good conducting substance. For instance, if a copper wire, say No. 4, B. W. G. (0.238 inches diameter), were carried round the foundation of the house, up each of the corners and gables, and along the ridges, this would probably be a sufficient protection for an ordinary building against any thunderstorm in this climate. The copper wire may be built into the wall to prevent theft, but should be connected to any outside metal, such as lead or zinc on the roof, and to metal rain-water pipes. In the case of a powder-mill it might be advisable to make the network closer by carrying one or two additional wires over the roof and down the walls to the wires at the foundations. If there are water or gas pipes which enter the building from without, these must be connected with the system of conducting wires; but if there are no such metallic connections with distant points, it is not necessary to take any pains to facilitate the escape of the electricity into the earth. But it is not advisable to put up a tail pointed conductor.

STEAM MACHINERY AND PRIVATEERING.

Mr. Barnaby, a prominent English naval constructor, has written a memorandum on the British mercantile marine as an adjunct to the navy in time of war. He points out that privateering has been made obsolete, not merely by popular feeling, but also by the progress of the arts. A privateer, he thinks, must be prepared to meet regular ships of war of about the same strength. This the introduction of steam machinery has made impossible. War ships are built for security, merchant steamers for economical work, and the different objects have necessitated different arrangements. In a word, the machinery of war ships is carefully disposed below the water line, that of marine vessels is usually above the water line. The latter would therefore be much more subject to injury from shot than the other. This state of things excludes from service as privateers all but the swiftest vessels, and Mr. Barnaby thinks that the use of the merchant marine "would be confined to ships that could save themselves by their speed if they met a ship of war, whether armored or not," and that only those which can steam eleven and a half or twelve knots an hour can be considered serviceable for privateering. This limits the number of vessels available for this service to 400 or 500, and the common idea that England can, in case of war, "cover the sea" with her ships is proved to be untrue. Even these vessels could not be used as privateers except against certain nations. The Government would be compelled to buy them, and this would cost, he estimates, a hundred to a hundred and fifty million dollars. This addition to the regular fleet he thinks would enable England to "close up every hostile port, and the slow steamers and the helpless sailing ships might cross the seas in such security (privateering not being admissible) that merchandise would be as safe in the English ship as in the neutral." The fault in all this reasoning is that a ship of inferior speed is certain to meet with a swifter antagonist, and therefore become a capture. Our experience with the Confederate cruisers was that the efforts of a very large navy may be eluded and defied for years, without regard to the sailing qualities on either side.

MAN AND ANIMALS.

The influence upon animals of their association with man formed the subject of an interesting discussion in the British Association meeting. Mr. Shaw read a paper "On the Mental Progress of Animals During the Human Period," and Dr. Grierson mentioned an instance of intelligence which had come under his own notice. Five years ago a barrel was put up in his garden at the top of a high pole. The barrel was perforated with holes and divided in the centre. In the course of two days two starlings visited the barrel, and returned on the following day, and in about a week afterward two pairs of starlings came and occupied it, and brought up their young. They were very wild starlings, and readily took flight when any person went near the barrel. In the second year four pairs of starlings occupied the barrel, and they were much tamer than the previous ones, and this last year there were a number of pairs of starlings so tame that they would almost allow him to take hold of them. They had now changed their mode of speaking, for the starlings in his garden frequently articulated words.

THE LIMBS OF WHALES.

Whales have rudimentary limbs, and Prof. Struthers concludes that such muscles existed in the whale-bone whales, but in ordinary teethed whales they were merely represented by fibrous tissue. These muscles existing in the true bottle-nosed whale had a special interest, as the teeth in that whale were rudimentary and functionless. He had found these muscles in the forearms of whales largely mixed with fibrous tissue, so the transition was easy. Prof. MacAlister of Dublin thinks that whales were not of very ancient origin, for the existence of the rudimentary limbs tends to show that a sufficient length of time has not elapsed since the use of the limb was essential to the earlier animal to produce its complete obliteration.

OUR EDUCATIONAL STANDING.

The advance which this country has made in educational facilities of all grades within its hundred years of life was summarized as follows by Prof. Phelps, President of the National Educational Association:

"Prior to 1776 but nine colleges had been established, and not more than five were really efficient. Now there are more than 400 colleges and universities, with nearly 57,000 students, and 3,700 professors and teachers. Then little was done for the higher education of women. Now there are 209 female seminaries, 23,445 students, and 2,285 teachers. There are also 322 professional schools of various classes, excluding 23,280 students and 2,490 instructors. Then normal schools had no existence. Now there are 124, with 24,405 students and 966 instructors. There were then no commercial colleges. Now 127 are in operation, with 25,892 students and 577 teachers. Then secondary and preparatory schools had scarcely a name by which to live. Now 1,122 are said to exist, affording instruction to 100,593 pupils, and giving employment to 6,163 teachers. The kindergarten is a very recent importation. In 1874 we were blessed with 55 of these human nurseries, with 1,636 pupils and 125 teachers. Now 37 States and 11 Territories report an aggregate of more than 13,000,000 school population, or more than four times the total population of the country in 1776. Then the school enrollment was of course unknown. Now it amounts to the respectable figure of about 8,500,000. Then the schools were scattered and their number correspondingly restricted. Now they are estimated at 150,000, employing 250,000 teachers. The total income of the public schools is given at $82,000,000, their expenditures at $75,000,000, and the value of their property at $165,000,000. The number of illiterates by the census of 1870 above the age of ten years, in round numbers, was 5,500,000. Of these more than 2,000,000 were adults, upward of 2,000,000 more were from fifteen to twenty-one years of age, and 1,000,000 were between ten and fifteen years. Of the number between fifteen and twenty-one years it is estimated that about one-half have passed the opportunity for education."

SURFACE MARKINGS.

Mr. James Croll, in a letter to "Nature" (July 13, 1876), incidentally mentions the lessons that may be derived from the configurations of the earth's surface.

"Given the hardly perceptible wearing of water and time, a cañon a mile deep, and many hundreds of miles long, has resulted from the flowing of a stream. Given glacial 'abrasion' and time enough, then valleys of rounded section and firths and lake-basins of a particular kind probably resulted from the flowing of ice.

"Where a stream flows from source to mouth on a gradual slope, there has been no great disturbance of level since the stream began to work. Where ice fills the dales there are no cañons. Where ice has filled dales and has left fresh marks, cañons are short and small. In mountain regions, where ice-marks are rare or absent, cañons are of great depth and length, apparently because their streams have flowed in the same channels ever since the mountains were raised. But where cañons are marked features, these lakes, firths, and dales of rounded section are very rare, or do not exist. It seems therefore that hollows which have, in fact, been carved out of the earth's surface may be known for water-work or for ice-work by their shape, and that firths, dales, and lakes may mark the sites of local glacial periods; and cañons the sites of climates that have not been glacial since the streams began to flow."

THE OLDEST STONE TOOLS.

One of the problems which geologists now propose to themselves is to ascertain definitely whether the existence of man before the close of the glacial epoch can be certainly proved. The method of proof consists in the examination of formations older than those of that epoch, in the hope of finding in them bones or implements of human origin. Mr. S. B. J. Skertchly thinks he has done this. In the valley sides around the town of Brandon, in England, "are preserved patches of brick-earth, which are valuable as affording the only workable clay in the district. Whenever these beds are well exposed they are seen to underlie the chalky boulder-clay of glacial age. Of this there cannot be the slightest doubt, for the glacial bed is typically developed and not in the slightest degree reconstructed. In these beds I have been so fortunate as to find palæolithic implements in two places; and in one of them quantities of broken bones and a few fresh-water shells. The implements are of the oval type, boldly chipped, but without any of the finer work which distinguishes the better made palæolithic implements. Although it would be rash to lay too great a stress upon the characters of these implements, it is nevertheless worthy of remark that they do belong to the crudest type. Equally rough specimens are found in the gravels above the boulder-clay, and even among neolithic finds. Still these very antique implements certainly do seem to belong to an earlier stage of civilization, if we regard them as examples of the best workmanship of their makers." These, he thinks, are the oldest specimens of man's handiwork known, and prove him to have lived before the culmination of the glacial epoch.

ORIGIN OF THE SPANISH PEOPLE.

An anthropologist, M. Turbino, has written a paper on the relations of the people who inhabit Spain and Portugal, from which it appears that those civilized races present a heterogeneity that reminds us forcibly of the condition in which the savage tribes of America were at the time of the discovery, and indeed are still. There is found in the Spanish races no unity of origin or of physique. There is not only dissimilarity, but also antithesis and opposition. M. Turbino endeavored to show that the same diversity existed in the region of morals, in language, in art, and in the ideas of right and law, and that thus there is really no Spanish race and no means of establishing in the Iberian Peninsula a centralized state.

Broca, in discussing these facts, asserted that the same state of things exists everywhere; that the idea of race as applied to the people of the present political divisions is untrue. The only great barriers of states are their geographical limits.

THE ENGLISH METEORITE.

Prof. Maskelyne, of the British Museum, seems to be particularly gratified by the fall of a metallic meteorite in England. He says:

"It is, indeed, an iron meteorite, and the special interest of this statement lies in the fact that, though our great collection of 311 distinct meteorites at the Museum contains 104 indubitable iron meteorites, the falls of only seven of the latter were witnessed. The collection contains eight stony meteorites that have fallen in the British Islands; but the Rowton meteorite is only the second iron meteorite known as having been found in Great Britain."

It weighs seven and three-quarter pounds, is angular in shape, and he supposes that it is but the fragment of a much larger aerolite, since one loud explosion was heard and rumbling sounds, which may have denoted others, were heard before it fell.

THE BOOMERANG.

Mr. A. W. Howitt, after many years' observation in Australia, reports that the boomerang, though a singular, is not the marvellous instrument which we are told of in some books of travel; especially does he deny it the power of continuing its flight after striking its object, and also the power of returning with exact aim to the thrower's hand. That might be in an instrument which was made with theoretical perfectness, but as it is the return flight is very wild. He had a trial made by several natives, one of them a boomerang thrower of great skill. The ground was good, and the only drawback was a light sea breeze. He found that the throws could be placed in two classes, one in which the boomerang was held when thrown in a plane perpendicular to the horizon, the other in which one plane of the boomerang was inclined to the left of the thrower.

In the first method of throwing the missile proceeded, revolving with great velocity, in a perpendicular plane for say one hundred yards, when it became inclined to the left, travelling from right to left. It then circled upward, the plane in which it revolved indicating a cone, the apex of which would lie some distance in front of the thrower. "When the boomerang in travelling passed round to a point above and somewhat to the right of the thrower, and perhaps one hundred feet above the ground, it appeared to become stationary for a moment; I can only use the term hovering to describe it. It then commenced to descend, still revolving in the same direction, but the curve followed was reversed, the boomerang travelling from left to right, and, the speed rapidly increasing, it flew far to the rear. At high speed a sharp whistling noise could be heard. In the second method, which was shown by 'bungil wunkun,' and elicited admiring ejaculations of 'ko-ki' from the black fellows, the boomerang was thrown in a plane considerably inclined to the left. It there flew forward for say the same distance as before, gradually curving upward, when it seemed to 'soar' up—this is the best term—just as a bird may be seen to circle upward with extended wings. The boomerang of course was all this time revolving rapidly. It is difficult to estimate the height to which it soared, making, I think, two gyrations; but judging from the height of neighboring trees on the river bank, which it surmounted, it may have reached one hundred and fifty feet. It then soared round and round in a decreasing spiral, and fell about one hundred yards in front of the thrower. This was performed several times. The descending curve passed the thrower, I think, three times.

"Another method of throwing was mentioned; namely, to throw the boomerang in such a manner that it would strike the ground with its flat side some distance in front of the thrower. It would then rise upward in a spiral, returning in the same. This was not attempted, as it was decided the boomerang was not strong enough. A final throw in a vertical plane, so that the missile struck the ground violently fifty or sixty yards in advance, terminated the display. It ricocheted three times with a twanging noise and split along the centre. My black friends said they should soon manufacture a number of the best constructed 'wunken' to show me. I observed that the spectators stood about a hundred yards on one side of the thrower, and when the boomerang in its gyrations approached us, every black fellow had his eyes sharply fixed on it. The fact stated by them that it was dangerous was well shown in one instance, where it suddenly wheeled and flew so close over us that I and Toolabar fell over each other in dodging it."

A WESTERN LAVA FIELD.

Lieutenant Ruffner describes one of the great lava outflows in the West in a way that serves to set before the reader the magnitude of the eruptions which have made America par excellence the volcanic continent. It is in New Mexico.

From the Conejos river, in Colorado, one continuous sheet of lava covers the face of the country to the south, for eighty miles unbroken; and then for fifty miles further is now exhibited in outlying areas and detached masses, separated from the main body by the exercise of the power of erosion through prolonged ages. One hundred and thirty miles in length, and perhaps thirty in breadth at its widest, the area of a principality lies swallowed up for ever. From craters existing probably in the San Antonio mountain and in the Ute Peak, near the boundary of Colorado, and possibly from other centres, this flood poured over the land. Reaching to the east, it was checked by the mountains of the Sangre de Cristo range; flowing to the west, the mountains and hills of the main divide, and the spur now between the Chama and the Rio Grande, limited its extent. To the south it was deflected westwardly by the spur of the mountains called the Picuris range, some fifteen miles south of Taos. Protected by this spur, we find the east bank of the Rio Grande for many miles free from the flux. Confined on the west by the slopes of the Jemez mountains, the breadth of the field is narrowed. But from the village of San Ildefonso to Pena Blanca, we find the lava on both sides of the Rio Grande, spreading to the east as far as the Santa Fé creek. Secondary centres in the Jemez mountains possibly contributed to this extension, but the main force of the eruptions was probably felt further to the north. However, in this vicinity the edges and extremity of the field have been reached, and there has been so much erosion in places since its deposition, that outlying masses, as in the bluffs to the west of San Felipe, alone remain. Throughout the whole region thus depicted, the lava field is the great and controlling element. The streams that have eaten their way through it with untold difficulty are found in narrow and deep cañons having no land for cultivation. A dangerous feat for man to descend these precipices, the passage by an animal of burden is almost impossible. The Rio Grande passes for eighty miles or more through its black abyss, with walls of seven or eight hundred feet in height, crowned with perpendicular cliffs of solid lava, two and three hundred feet high. Throughout the whole region there is no agriculture.

THE PRINCIPLE OF CEPHALIZATION.

In the last of a series of papers on cephalization (or brain development) as a fundamental principle in the development of the system of animal life, Prof. Dana says ("American Journal," October, 1876): "I would refer to the case among mammals for an illustration of the principle that the lowest forms are those having their locomotive functions located in the posterior parts of the body; and that in the higher the forces, or force organs, are more and more forward in the structure. For example, in the whale the tail is the propelling organ, and is of enormous power and magnitude, and the brain is very small, and is situated far from the head extremity in a great mass of flesh and bone furnished with poor organs of sense; a grade up, in the horse or ox, the tail or posterior extremity is no longer an organ of locomotion, and is little more than a caudal whip lash, and locomotion is performed by organs situated more anteriorly, the legs, and a well-formed head carries a brain which is a vastly higher organ of intelligence than that of the whale, but the legs are simply organs of locomotion, and the hinder are the more powerful; and higher up, in the tiger or cat, the fore legs—not the hind legs—are the organs of chief muscular force, and these have higher functions than that of simple locomotion, and further, the body is proportionately shortened, and the head is shortened anteriorly, or in the jaws, and approximates thus toward the condition of man. The existence or not of a switch-like tail, as in ordinary quadrupeds, has little bearing on the question of the degree of cephalization, since the organ is not an organ of locomotion, or one indicating a large posterior development of muscular bone. But, approaching man in the system of life, even this seems to have significance."

CURIOSITIES OF THE HERRING FISHERY.

The hot weather last summer affected even the herring fishery. The fishermen off the Scotch coast had been supplied with sea thermometers by the Scottish Meteorological Society, and they found that during one week, when the sea water showed a temperature of 58 deg. to 59 deg., no fish were caught. But when the temperature fell to 55 deg. the herring were caught in great abundance. Indeed, they flocked to the land in such numbers that many nets were taken to the bottom with their weight, and the fishermen lost considerable sums from this odd mishap. The action of the Meteorological has produced important results. The entirely new discovery has been made that the herring love cold water, and in seasons when the temperature of the sea water rises, they keep away from the land, in deeper water, between the fifteen to eighteen fathoms for which the nets are calculated. The colder the weather the greater is the take of fish; 1875, a year when the water was considerably and continuously warmer than 1874, having been a poor year, while the latter was a better one. This action of the fish makes it probable that it likes a given range of temperature, neither too high nor too low. In cold water this belt of agreeable temperature is found nearer the sun-warmed surface, and the fish creep inshore. Many singular facts relating to this fishery are known. If a thunderstorm occurs, the fishermen expect a good catch on that day, but the next day they will get none except in deep water, and the supposition is that the fish are leaving the land. The herring has a strong sense of locality, always returning to the same ground. Experienced dealers can tell by inspection in just what sea or loch a given lot of fish were caught.

NATURAL GAS IN FURNACES.

A paper describing the use of natural gas in the puddling furnaces at Leechburg, Pa., was presented by Mr. A. L. Holley to the American Institute of Mining Engineers. This well is about twenty miles northeast of Pittsburg, on one of the side tributaries of the Alleghany river. It had been drilled in search of oil to a depth of 1,250 feet in 1871, but none was found. A great flow of gas was developed, however, accompanied by a slight spray of salt water, and this has continued with little or no diminution to the present time. The gas in its escape has been discharged through a five-inch pipe, and at a pressure of from sixty to eighty pounds per square inch. The rolling mill of Messrs. Roger & Burchfield is on the opposite side of the river, and it has been for some years devoted to the production of fine grades of sheet iron from charcoal pig metal, by puddling and in knobbling fires. The usual weekly product of the mill has been thirty tons of No. 3 tin plates and fifty tons of No. 24 to twenty-eight sheets.

The well was bought by this firm for $1,000, and the gas is led across the river, a distance of 500 feet, through a three-inch pipe. It is distributed through half-inch pipes, and at a pressure of about forty-five pounds per square inch, to several of the furnaces. No essential alteration in any of the furnaces has been found necessary in the use of the gas fuel, except to brick up the fire bridge and to put in the gas and air pipes. The old grate used for coal is loosely covered with bricks and cinder, so that a slight percolation of air may take place through them. The gas is admitted through a half-inch pipe, and blows toward the fire-bridge through eighteen or twenty one-eighth inch jets. The air is blown in, at about 2 lbs. pressure, through two one and one-eighth-inch jets, obliquely down upon the centre of the hearth, and a very perfect combustion is obtained. A great improvement is effected in the quality of the product of the puddling furnaces by the combined action of the gas and air blast. The air is blown in during the melting, but it is then shut off until the boiling begins. It is then turned on full, and a violent boiling action is maintained without any rabbling. Many advantages result from the use of this fuel. The product of the mill has increased about thirty per cent., from sixty to seventy tons of coal are saved daily, besides the labor necessary to fire with it, and a poorer quality of iron can be used in making the tin plate. Thus the iron now used is credited to the furnace at $45 per ton, while charcoal blooms have cost $80. These are certainly enormous advantages, and though every mill cannot have a permanent gas well, it must be more economical to produce such results by making coal into gas than to continue using it in the solid form. The gas at Leechburg is used in fourteen furnaces and under seven boilers. Its composition is carbonic acid, 0.35; carbonic oxide, 0.26; illuminating hydrocarbons, 0.56; hydrogen, 4.79; marsh gas, C H₄, 89.65; ethyl hydride, C₂ H₆, 4.39; specific gravity, 0.558. This analysis shows about 57 per cent. of carbon and 42 per cent. of hydrogen. If the well discharges one million cubic feet of gas daily, it would weigh about sixty tons, yielding thirty-nine tons of carbon. Mr. Holley calculates that it equals about 150 tons of bituminous coal, such as is found in the Pittsburg region.

SOUTH CAROLINA PHOSPHATES.

In England the favorite source of phosphates of lime is the "Cambridge coprolites." These are small, hard, gray nodules, obtained by washing a stratum, of about one foot in thickness, lying in the upper greensand formation in Cambridgeshire. Similar coprolites are found and mined in other districts of England, but they are of inferior quality, containing more oxide of iron and alumina. These give the tribasic phosphate of lime, which results from the application of sulphuric acid to the nodules, a tendency to "go back" to the insoluble condition. French nodules are of inferior quality from another cause. They contain very much silica, sometimes even forty per cent. The Cambridge coprolites are so much esteemed that buyers of artificial manure often stipulate that it shall be made from them. As a consequence the privilege of mining the ground is costly, sometimes as much as $1,500 an acre being paid. The yield is about three hundred tons to the acre. An English chemist reports that the South Carolina phosphate, made in factories situated in and near Charleston, ranks next in value to this Cambridge product. It contains 54 per cent. of tribasic phosphate of lime, 14 per cent. of carbonate of lime, 3-1/2 per cent. of iron oxide and alumina, 2-1/2 per cent. of fluoride of calcium, and 15 per cent. of silica. It consists of bone fragments derived from animal species which are now extinct. These bones have accumulated in old river beds, and the mining operations are compelled to follow the sinuosities of these streams. Though a supply derived from such sources is necessarily limited, the quantity known to be available is very great, and has been estimated to last a century with a yearly extraction of 50,000 tons. In addition to the river phosphate is a lighter deposit, occurring in a stratum of sand and clay about two feet thick; but this is not so valuable, though it is softer and easier ground. The river deposit is nearly black, and when ground makes a very dark powder. It is a great favorite, and in some respects the finest natural source of phosphatic manure in the world.

RARE METALS FROM OLD COINS.

The operations of the Government assay office in Frankfort during the last year have developed the fact that gold, platinum, palladium, and selenium are found in old silver coins and also in ores which were formerly supposed to be nearly pure sulphides and oxides of lead and silver. From 400,000 pounds of silver and 5,000 pounds of gold were obtained twelve pounds of platinum, two pounds of palladium, and several pounds of selenium. To obtain these the gold is first precipitated from the solution by ferrous chloride, all the other metals by iron turnings. The precipitate is first submitted to the action of ferric chloride to dissolve the copper, and the residue is fused with charcoal and soda to separate the selenium. The regulus from this operation is dissolved, and a compound of selenium and palladium, or of these with platinum, is obtained. They are composed of equal atoms of the two metals and form hard brilliant plates. The presence of these metals in coins is less remarkable than in such ores as those of Commern and Mechernich on the west bank of the Rhine. These ores occur as small granules of galena in a soft sandstone, their origin being still a mooted point. The ore yields a very soft and pure lead, though the presence of pyrite prevents the manufacture of the virgin lead used in making the best brands of white paint.

A FRENCH MOUNTAIN WEATHER STATION.

The French government has placed on the top of the Puy de Dome a meteorological observatory, which, as that is the highest land in France, answers to our stations on Mt. Washington and Pike's Peak. It is, however, constructed in a style very different from those somewhat forbidding abodes. At the top is an observatory tower, placed on a platform, and upon this is placed the anemometer, especially constructed to withstand the force of the storms. Within the tower is a well hole fifty feet deep, which leads to a tunnel more than a hundred feet long, at the end of which is placed the keeper's house. This is a massive building, situated a short distance from the top, where it is partly protected by rocks. The whole work cost $45,000, and $20,000 more will be spent in supplying it with apparatus.

MIGRATION OF THE LEMMING.

A new theory has been broached to explain the migrations of the Norway lemming, a variety of field mouse. Every few years an immense body of these animals leaves their habitat and proceed westward, attacking every obstacle in front in preference to flanking it, until it reaches the sea, which the little animals boldly enter, only to perish there. No conceivable advantage to the lemming is known to have ever resulted from these long and arduous marches. The losses in swimming large rivers, from fire, the attacks of predatory animals, hunger, and fatigue, are so great that but few reach the sea, and the remnant always perish there. Mr. W. Duppa Crotch, who has studied the habits of these animals for ten years, now suggests that they are moved by an hereditary instinct, and that their prehistoric home was some country west of Sweden, and now covered by the Atlantic. The same kind of reasoning would allot an Atlantic origin to the progenitors of the grasshoppers, which have been such plagues in this country for a few years, for, as stated in the August "Galaxy," those which moved eastward in 1875 did not halt until they perished on the ocean beach or in its waves. Mr. Crotch has thrown new light on some of the habits of the lemming. According to him, says "Nature," the migration is not all completed in one year, as formerly supposed, nor do they, as stated, form processions and cut their way through obstacles; but, breeding several times in the season, they gather in batches, and at intervals make a move westward. Their pugnacity, he states, is astonishing, and the approach of any animal, or even the shadow of a cloud, arouses the anger of this small creature like a guinea pig, and they back against a stone or rock uttering shrill defiance. Our author found, in most examples, a bare patch on the rump, due to their rubbing against the said buttress of support when at bay. He wonders why a bare patch, and not a callosity, should not result from this innate, apparently hereditary habit.

NEW DISCOVERY OF NEOLITHIC REMAINS.

A very interesting discovery of human remains has been made in a cave in Cravanch, about two miles northwest of Belfort, France. Some workmen, excavating in a quarry of Jurassic limestone, found the opening to the cave, the bottom of which was covered with stalagmites, while there were no corresponding stalactites hanging from the roof. Some of these calcareous columns appear to be artificial piles covered with the limestone sheeting. Between them, and also covered with stalagmite, were a quantity of human skeletons, with the skulls raised above the rest of the bodies. A number of weapons and implements, together with a mat of plaited meshes, have been found, all belonging to the polished stone period. It is thought that careful search may uncover remains of an earlier date. The cave is quite large, a hundred feet long and forty wide and high. It was at once taken possession of by the authorities and placed under the charge of Mr. Felix Voulot, who hopes to extract at least one skeleton entire.

OCTOBER WEATHER.

The most noticeable features of the month are: the hurricane of the 17th to 23d; lower temperatures in the districts east of the Rocky mountains; large excess of rainfall in some districts and large deficiencies in others; low water in the rivers.

Areas of High Pressure.—These have generally appeared in the Upper Missouri valley, from whence their movements have been south and eastward across the country. Their advance has been frequently marked by high northerly winds and gales, especially when preceded by decidedly low-pressure areas, in the more northern districts and on the Texas coast. When rainy weather has preceded them, the fall in the temperature has been sufficient to turn the rain into sleet and snow, while frequent and heavy frosts have been produced.

Areas of Low Pressure.—Nine have been traced. Excepting the hurricane of the 17th to 23d, the centres of all have moved over the northern sections, and further northward than during previous Octobers. They have been frequently accompanied by barometric troughs, extending south or southwestward toward the Gulf, in which rainy weather and high winds or gales have prevailed.

Temperatures.—

Maximum.Minimum.

Albany70deg.23deg.

Boston70"26"

Buffalo73"24"

Cape May73"34"

Chicago73"28"

Cincinnati74"29"

Cleveland75"26"

Detroit72"24"

Duluth67"23"

Jacksonville85"43"

Marquette73"28"

Mt. Washington48"5"

New Orleans84"50"

New York73"31"

Pike's Peak41"-2"

Philadelphia75"31"

San Diego80"48"

San Francisco72"52"

Washington78"30"

The first frost of the season is reported from a large number of stations, and first snow from about twenty.

Verifications.—The average is 92.8 per cent. for the weather; 90.1, wind direction; 91.1, temperature; 87.7, barometric changes. For the whole country the average verified is 90.4 per cent. There were four omissions to predict out of 3,720, or 0.1 percent.

A severe earthquake shock was felt at San Francisco at 9:20 p.m., on the 6th, lasting ten seconds; motion from northwest to southeast. A second and lighter shock was felt the same day.

FRENCH NATIONAL ANTIQUITIES.

Probably few American travellers visit a collection of antiquities, infinitely older than the paintings, statues, and relics of mediæval life, or even than those of Roman and Grecian age, but which is as freely open to them, near Paris. This is the museum which has been established in the château of Saint Germain. France has been particularly fortunate in rescuing fragments of the life which existed within her borders long before the day of the very earliest races to which history points us. These fragments have sometimes been preserved in the most fortuitous manner, and afford unique illustrations of the remarkable accidents to which man is occasionally indebted for his knowledge. The fossil man of Denyse, whatever his age may have been, has been preserved for our inspection by becoming overwhelmed in a volcanic eruption. The skeleton of Mentone was found by Rivière while engaged in a systematic search among French caves. Other caves in France have preserved evidences sufficiently distinct for us to gain valuable hints of ancient life. In fact all the ages of man, so far as they are recognized, and all the kinds of proof concerning them, are well represented in French collections. During the reign of the late Emperor this museum was founded, and has received the case of many noted French savants who have won distinction in this field of research. The walls are covered by finely painted maps illustrating the distribution of caves, and rock shelters, and places where instruments of stone, bone, and bronze have been found. Pictures are also exhibited which illustrate the views of former social customs which are thought to be supported by the material evidences assembled in the château. In the cases are not only large collections of celts, but also the carved bones, horn, and stones which, by their distribution through the stalagmite of caves, or through the gravel of ancient river beds, give infallible proof of the presence of man. One floor contains a collection not less interesting, though illustrating the manners of a much later age. It is formed of the military weapons, bridges, fortifications, camps, etc., which were constructed to illustrate the "life of Cæsar," by Napoleon. This collection is, and will probably remain, unique. At the meeting of the Geographical Congress last year, these great engines of war were taken to the park and exhibited in action. The museum is now placed under the control of the historical commission for constructing the map of Gaul. This body is publishing a series of maps and engravings to illustrate the progress of the science of the prehistoric and subsequent periods. A catalogue of the collections has been made and is sold to visitors. There is also in the establishment a special library in which has been collected by M. Gabriel de Mortillet all the books relating to prehistoric antiquities, and which is open free on certain days to the public.

It is found that insects preserve their colors better under yellow glass than in any other color. The curtains of entomological show-cases and the blinds of the room should be yellow. Only in this way can the delicate carmine tints of some insect wings be preserved.

A student of animal nature announces a case of two hens, who by joint efforts hatched one chick. They have since, for some weeks, been parading the yard, each clucking and manifesting all the anxiety and care of a true mother over this one. The hens never quarrel, or show the least appearance of jealousy or rivalry.

M. Tresca, who has charge of the Conservatoire des Arts et Métiers, the institution which in Paris answers to our Patent Office, says that drawings of new inventions are more useful than models, are cheaper, and are very much oftener consulted. In Paris the model room is covered with dust and rarely entered.

The French weather bureau intends not only to study the thunderstorm, hailstorm, rainfall, inundations, and frosts, with especial reference to their effects upon agriculture, but also to experiment upon the asserted effect of smoke as a preventive to frost. The experiments will be extensive and may cover a large valley.

To discover by the spectroscope the smallest quantity of a gaseous or very volatile hydrocarbon, the Messrs. Negri introduce a small quantity of the gaseous mixture into a tube. This mixture should not contain oxygen, carbonic oxide, or carbonic acid; and the pressure is to be reduced to not more than twenty millimetres. Then if a hydrocarbon is present, the passage of a spark from a Ruhmkorff's coil will cause the appearance of a sky-blue light. Viewed with the spectroscope, this presents the spectrum of carbon, and generally so brilliant as to mask totally the spectra of other gases present.

The rare metals cerium, lauthanum, and didymium have been lately investigated by Drs. Hillebrand and Norton, in Bunsen's laboratory. Cerium looks like iron, having both its color and lustre, but is heavier, and has the hardness of calcite. It tarnishes slowly in dry air and rapidly in moist air. It ignites so readily that pieces scratched off inflame, and its wire burns more brilliantly than magnesium wire. Lauthanum is a little harder, but also a little lighter. It tarnishes more easily and inflames less easily than cerium. Didymium resembles lauthanum. The metals were all obtained by electrolysis of the chlorides.

It is stated that a week's work in Birmingham comprises, among its various results, the fabrication of 14,000,000 pens, 6,000 bedsteads, 7,000 guns, 300,000,000 cut nails, 100,000,000 buttons, 1,000 saddles, 5,000,000 copper or bronze coins, 20,000 pairs of spectacles, six tons of papier maché wares, over £30,000 worth of jewelry, 4,000 miles of iron and steel wire, ten tons of pins, five tons of hairpins and hooks and eyes, 130,000 gross of wood screws, 500 tons of nuts and screw bolts and spikes, fifty tons of wrought iron hinges, 350 miles' length of wax for vestas, forty tons of refined metal, forty tons of German silver, 1,000 dozens of fenders, 3,500 bellows, 800 tons of brass and copper wares—these, with a multitude of other articles, being exported to almost all parts of the civilized world.

The aërated beverages of which Americans are so fond should not be kept in copper vessels, for carbonic acid (which is the gas present) dissolves this metal with great avidity. From three-hundredths to one-tenth of a grain of copper per gallon has been found in aërated lemonade, ginger ale, soda water, etc.

In making the ultimate analysis of organic compounds by combustion, with lead chromate and metallic copper reduced by hydrogen, the results obtained are too high, on account of the expulsion of hydrogen, which had been occluded by the copper. Heating the copper to 150 deg. C. does not prevent the error, which may be .05 per cent.

Mayer & Walkoff, who have been experimenting on the respiration of plants, find that the action goes on both in light and darkness, and that changes of temperature within normal limits have little effect. There is no direct relation between growth in length and respiration, a conclusion that is in conflict with that of previous experiments.

The famous "Blue Grotto" in the island of Capri, Italy, has been investigated spectroscopically. Most of the light enters through the water, which absorbs the red rays entirely and so much of the yellow as to make the D line scarcely visible. The green, blue, and indigo rays are very bright, and the F and b lines unite in a well marked absorption line.

The springs of Weissenburg in the Bernese Oberland yield a water which is popularly supposed to have the power of cicatrizing cavities in the lungs, but its analysis shows no reason for such a power. Sulphates of lime and magnesia are its principal solid ingredients, with chloride and a little iodide of lithium and an organic compound having the odor of blackberries.

The mountains about Innsbruck in the Tyrol, as well as other parts of the Alps, present the singular phenomenon of a climate more moderate at a considerable elevation than in the valleys. Prof. Kerner finds that there is a warm region midway up the mountain, lying between two colder zones above and below it. We have heretofore referred to a similar phenomenon in Indiana.

It is remarked by anthropologists that differences of color are one of the most marked signs of race. The Aryan word for caste is Varanum, meaning color, and the Aryans are supposed to have used it to distinguish themselves from the Dasyuf, with whom they came in contact on crossing the Indus, when migrating from Central Asia. The first migrating wave from that centre of human creation can no longer be traced, and only its remnants are found among the most degraded of the hill tribe and slave population in India. Prof. Rollesten thinks that the earliest races of man were preëminently of the Australioid type, which is now brown-skinned and wavy haired, with long narrow heads.

Messrs. Gladstone & Tribe have been investigating the results of the decomposition of alcohol by aluminium. When absolute alcohol, in which iodine has been dissolved, is poured upon finely divided aluminium in a flask, energetic action takes place and large quantities of hydrogen are evolved. A pasty mass remains, and this heated to 100 deg. C., gives off alcohol, and leaves a solid residue, which liquefies at 275 deg. C., alcohol and an oily body containing iodine passing over. At a higher temperature, this product was again decomposed, with formation of alcohol, ethylene, and alumina. But the most interesting results were obtained under diminished pressure. Then a greenish white solid sublimed, and this was found to be aluminic ethylate. This is therefore the second known organometallic body, containing oxygen, which is capable of distillation, cacodylic oxide being the other.