Volume 1 — MISCELLANY. SCIENCE.

The Mason-Spider of Corfu.—A correspondent of a London journal gives an interesting account of certain habits of this insect, which belongs to the mygalidae family. The mygales are chiefly found in hot climates, and include the largest specimens of spiders known. They are called mason-spiders, from the curious manner in which they build their houses. "The mygale nest," says the correspondent, "varies much in size, from one inch in length to three or four, and even six or seven inches. In the West Indies, where the spiders are crab-like, the insects measure six inches over. One nest, especially mentioned and minutely described by Mr. Oudouin, was three inches and a quarter long and eight-tenths of an inch wide. The nest, of cylindrical form, is made by boring into the earth; making his excavation, the next thing, having decided upon the dimensions of his habitation, is to furnish it, and most beautiful are his paper-hangings. The whole of the interior is lined with the softest possible silk, a tissue which the 'major domo' spins all over the apartment until it is padded to a sufficient thickness and made soft enough. Silk lining like this gives the idea of the mygale having a luxurious turn. This done, and the interior finished, the mygale shows his peculiarity by taking steps to keep out the of intruders by making not only a door, and that self-closing, but a door with swinging hinge, and sometimes one at each end of his nest, which shows that he has a very good opinion of his own work within, and knows how to take care of it. Not having met with any case where any one had seen the positive operation of making the door of these nests, I thought the details would be interesting, the more so as they corroborated preconceived ideas of their construction, and were noticed by a friend quartered at Corfu, who brought home the nest with him. The following is the description he gave me:

Instinct of Insects.—One of the regular course of free scientific lectures delivered at the Paris Sorbonne this last winter, under the auspices of the Minister of Public Instruction, was by the distinguished naturalist M. Milne-Edwards, on the instinct and intelligence of animals. Taking for his text the saying of Linnaeus, Natura maxime miranda in minimis, he spoke principally of the instinct of insects, and especially of solitary bees. These hymenoptera, in fact, afford one of the most striking examples known of that faculty which impels an animal, either for its own preservation or for the preservation and development of its offspring, to perform the most complicated and intelligent actions, readily and skilfully, yet without having learned how to do them. One species, the carpenter-bee (xylocopa), bores in the trunks of trees galleries running first horizontally and then vertically to a considerable depth. She then collects a quantity of wax and honey. The honey she kneads into a little ball of alimentary matter, in the midst of which she deposits her first egg. With the wax she constructs a horizontal partition, formed of concentric annular layers; this encloses the cell. On this partition she deposits a second egg, enclosed like the first in the provision destined for the support of the future larva; and over it builds another partition of wax; and so on, to the top of the vertical cavity. Then she dies; she never sees her offspring. The latter, so long as they remain larvae, feed upon the honey which the maternal foresight provided for them; and so soon as they have passed through their second metamorphosis and become winged insects, issue forth from their retreat, to perform in their turn a similar labor.

Another species of solitary bee, whose larva is carnivorous, resorts to a still more wonderful, but, it must be confessed, very cruel, expedient to supply the worm-like progeny with food. She constructs a gallery or tunnel in the earth, and crowns it with a chimney curved somewhat like a crosier, so as to keep out the rain. Then she goes a-hunting, and brings back to her den a number of caterpillars. If she kills them at once, they will spoil before her eggs are hatched; if she lets them alone, they will run away. What shall she do? She pierces the caterpillars with her venomous little dart, and injects into them a drop of poison, which Mr. Claude Bernard no doubt will analyze some day. It does not kill, it only paralyzes them; and there they lie, torpid and immovable, till the larvae come into the world and feast off the sweet and succulent flesh at their leisure.

Everybody is familiar with the habits and wonderful industry of hive-bees, wasps, and ants. These insects seem to be governed by something more than blind instinct: it is hardly too much to say that they give indubitable signs of intelligence. They know how to modify their course according to circumstances, to provide against unexpected wants, to avert dangers, and to notify to each other whatever is of consequence to be known by their whole community. Huber, the celebrated bee-keeper of Geneva, relates the following anecdote: One of his hives having been devastated one night by a large sphinx-moth, the bees set to work the next morning and plastered up the door, leaving only a small opening which would just admit them, one at a time, but which the sphinx, with its big body and long wings, could not pass. As soon as the season arrived when the moths terminate their short lives, the bees, no longer fearing an invasion, pulled down their rampart. The next season, as no sphinx appeared to trouble them, they left their door wide open.

Ostrich-keeping.—By late news from the Cape of Good Hope we learn that the farmers of that colony are beginning to find it profitable to keep flocks of ostriches, for the feathers of those birds are worth £25 sterling the pound. For thirty-five ostriches, there must be three hundred acres of grazing-ground. The plucking takes place once in six months; the yield of feathers from each bird being worth from £10 to £12, 10s. The original cost of the young ostriches is said to be £5 each. Some of the {136} farmers who have tried the experiment are of opinion that ostrich-feathers will pay better than any other produce of the colony.

Extraordinary Inland Navigation.—We hear from South America that a steamer built in England for the Peruvian government, for the exploration of rivers, has penetrated the great continent from the Atlantic side to a distance of ninety-five leagues only from the Pacific, or nearly all across. The vessel, which draws seven feet water, steamed seven hundred leagues up the Amazon, two hundred up the Ucayati, and thence into the Pachitea, which had never before been navigated except by native canoes. What a magnificent extent of inland navigation is here opened to commercial enterprise! The mind becomes somewhat bewildered in imagining the future of those vast river-valleys when hundreds of steamers shall navigate the streams, trading among millions of population dwelling on their banks.

Is the Sun getting Bigger?—It is known that various speculations have been put forward as to the cause or source of the sun's heat. Among those who consider that it consists in the falling of asteroids or meteorites into the sun, is Mr. J. R. Mayer, of Heilbronn, who states that the surface of the sun measures 115,000 million square miles, and that the asteroids falling thereon form a mass every minute equal in weight to from 94,000 to 188,000 billion kilogrammes. It might be supposed that this enormous shower would increase the mass and weight of the sun, and by consequence produce an appreciable effect on the motion of the planets which compose our system. For instance, it would shorten our year by a second or something less. But the calculations of astronomers show that this effect does not take place; and Mr. Mayer states that to increase the apparent diameter of the sun a single second by the shower of asteroids would require from 33,000 to 66,000 years.

Teaching the Deaf and Dumb to Speak.—Dr. Houdin, director of an institution for the deaf and dumb at Passy, lately announced to the French Academy, that after twenty-five years' experience he had proved the possibility of communicating the faculty of speech, in a certain degree, to deaf mutes. A commission appointed by the Academy and the Faculty to investigate the subject, reports that the learned doctor has really succeeded in several instances in teaching these unfortunate beings to speak and even comprehend spoken language so well that it is difficult to believe that they are not guided by the ear. The patients conversed with the members of the commission, and answered the different questions put to them. They were found to be perfectly familiar with the use and mechanism of speech, though destitute of the sense of hearing, and they comprehended what was said to them, reading the words upon the lips of the speaker with a marvellous facility. Thus they become fit to enter into society and capable of receiving all manner of instruction.

But here is another case still more wonderful. What would you do if you had to instruct and prepare for first communion a child who was at the same time deaf, dumb, and blind? The case is not an imaginary one; it has occurred in an asylum for deaf-mutes at Notre Dame de Larnay, in the diocese of Poitiers. A nun was there charged with the instruction of a child in this unfortunate state, to whom she could appeal only by the sense of touch. Yet the child, who astonishes everybody by her sensibility and intelligence, has come by that means to a knowledge of the spiritual life, of God and his divine Son, of religion and its mysteries and precepts—has been prepared, in fine, for a worthy reception of the Eucharist.