The body of the caterpillar is begirt by twelve rings, which approach to or recede from each other according to its motion; there are nine breathing-holes on each side of the body, seven eyes on each side of the head, and two small orifices below the jaws, through which the worm ejects its silken filament.

The art of using this filamentous substance seems to have originated with the Chinese, and to have been discovered at a very early period, and the raw material was purchased by the Persians, Tyrians, and Indians for a long time before it was introduced into Europe. For many ages silk bore an enormous price at Rome, but about the middle of the sixth century two monks arrived at Constantinople from India, bringing with them the white mulberry and the eggs of the silkworm, which have since been reared in Italy, Spain, France, and other parts of Europe.

FOOD OF THE SILKWORM.

The silkworm feeds, as every one knows, on the leaves of the white mulberry; or, when these cannot be obtained, upon those of the black mulberry; or, in lieu of these, upon the leaves of the common garden lettuce. The white mulberry is especially cultivated for the value of its leaves, its fruit being insipid and very inferior to that of the common species, the leaves of which are equally good in this country for the food of the silkworm. There has been a variety lately introduced from the Philippine Isles (_Morus multicaulis_), which has larger leaves, and which is easily propagated by cuttings put into a cuc.u.mber frame in October, and transplanted in the following May; yet, still, to ensure success in the rearing of silkworms the young naturalist should stick to the old black mulberry, as such trees are to be found in various vicinities. To propagate this, a branch from another tree may be set in the earth, which will frequently grow. The amiable Sir John Philipport of Hammersmith, so celebrated for his "Elysian groves and fountains fair," and for his sterling English qualities, has in his grounds a fine mulberry-tree, which he reared by placing a very loose branch in the ground in the autumn of 1850, which threw out roots, and started at once into a tree. The story of a gate-post made of a mulberry trunk becoming, and now remaining, a fruitful tree, is well authenticated. The leaves to be used should be those of a large and well-grown, prolific tree, and they should be gathered with care, so that the young buds of future leaves should in no way be injured; moreover, a tree should never be stripped twice in a year.

HATCHING, FEEDING, AND TEMPERATURE.

[Ill.u.s.tration]

Having procured the eggs, which should be obtained about the latter end of April--they are generally bought on slips of paper just as they were laid by the moth--they should be placed in trays made of stout cartridge or thin pasteboard of the form seen in the cut, and there should be provided to go over the case some thin gauze. The trays may be placed in a window facing the south, where they are fully exposed to the rays of the sun; there they should remain undisturbed till they begin to hatch; and as the young worms appear they should be removed into other trays, and fed with the mulberry leaves. The temperature should be regulated from sixty-six to seventy degrees, and the room ventilated, and preserved equally free from damp or too much dryness. They should be kept particularly clean, dead leaves and dung cleared carefully away, and in lifting them from one tray to another they should not be touched by the fingers, but removed by threads of cotton pa.s.sed under their bodies, or with a camel's-hair pencil.

MOULTINGS.

The caterpillar has four moultings, which may be all accomplished in the period of four days each, if the heat of the room be increased to from ninety-five to one hundred degrees of Fahrenheit. When the heat is regulated to a lower standard, the first moulting takes place on the fourth or fifth day after hatching, the second in four days more, the third in five or six days more, and the last in about eight days. Ten days more are required after this moulting, so that in about thirty-two days after hatching the caterpillar has attained its full size. During all these changes of the worm it requires the nicest attention.

[Ill.u.s.tration]

THE COc.o.o.n.

At the end of the time mentioned above the worms change to a clear pink or flesh colour, and look semi-transparent; they refuse their food, become restless, and prepare to spin or form their coc.o.o.n. At this time care should be taken to raise the walls of their tray habitation, or they will climb over them and be lost. What is called the coc.o.o.n nest should now be prepared by twisting the corners of a piece of writing-paper, and raising its edges into the form of the lower sh.e.l.l of an oyster. A number of these should be prepared and affixed to a piece of tape, with their pointed ends downwards; and into each one a single worm should be placed when it quits its food, and seems ready to spin: it will then dispose its web in such a manner as to leave a cavity within.

The coc.o.o.n consists of three distinct layers of silk: the first is loose and flossy, and is unserviceable for the silk manufacture; the second is closer, the silk crossing from side to side; and the third is still finer, and is glued strongly together, so as to form a compact inner coating.

THE AURELIA.

When the coc.o.o.n is completed, the enclosed caterpillar again casts its skin, with the head and jaws attached to it, when it appears under the form of a conical chrysalis of the ordinary shape. At first the chrysalis, when opened, exhibits only a yellowish fluid, but by degrees the various parts of the future moth appear, and in about a fortnight or three weeks a slight swelling of the chrysalis indicates the approach of another change; a rupture down its back succeeds, and by degrees the moth bursts through its h.o.r.n.y coating into the hollow chamber of the coc.o.o.n, and if left to itself would soon eat its way out.

[Ill.u.s.tration]

WINDING THE SILK.

The chrysalis, however, must be prevented from eating through the coc.o.o.n; and previous to the egress of the moth from its aurelian state, the silk must be wound off. When, by taking up the coc.o.o.n, it is found that the caterpillar has pa.s.sed into the aurelian state--which may easily be known by shaking it, as then the aurelia, from its harder texture and shrunken size, will be heard to rattle--then it is time to wind off the silk. The coc.o.o.n is placed in a cup of warm water, after the loose outward silk has been removed, and then, an end being taken, the whole continuous filament may be wound off on a piece of card. The length of the thread of a coc.o.o.n varies from 600 to 1,000 feet; yet the whole does not weigh more than three grains and a half. An ounce of eggs will produce about 40,000 caterpillars, which will consume 1,073 lbs. of leaves, and produce from 80 lbs. to 100 lbs. of coc.o.o.n, or about eight pounds of raw silk.

[Ill.u.s.tration]

THE MOTH.

When the silk is wound off the aurelia presents itself, and being put in a separate case, it remains motionless for about twenty days, when suddenly it appears as a pale yellow moth, with wings which seem scarcely adapted for flight. It crawls heavily about the place where it has been hatched, having a slight tremor in its wings, and eats nothing: the male speedily dies; the females hover about a while without flying, and lay their eggs on the slips of paper presented to them for that purpose. They then soon perish. The female moth generally produces about 300 or 400 eggs.

[Ill.u.s.tration: THE MOTH.]

GENERAL REMARKS.

The place where silkworms are bred, should persons wish to pursue their rearing upon a larger scale, must be free from noisome smells, cattle, and all noises. Persons attending them must be scrupulously clean in their persons, and wash themselves after every meal. Great attention must also be paid to the temperature of the apartment in which they are kept, which must also be free from all dust or smoke; and the most thoughtful and tender care is requisite in everything connected with their treatment and management.

[Ill.u.s.tration]

THE SQUIRREL.

The pretty little squirrel has long held a high place in the affections of pet-lovers, and there are few who have not admired the brisk lively movements, the full intelligent eye, and the soft bushy tail of this creature. To possess a tame squirrel is often a legitimate object of boy ambition, not unfrequently shared by their elders. In order to give our readers a few hints as to the procuring, management, and taming of this pretty playmate, we offer the following suggestions.

The first care of every intending possessor of a squirrel should be to prepare a comfortable home for the expected guest, so that the little creature may find its first a.s.sociation with captive life as agreeable as it can be made. In point of fact, the young naturalist should try to give to the squirrel's future home the greatest possible resemblance to the native domicile.

The very best house for a squirrel is an unused room, fitted up with strong tree-branches, and furnished with a cosy little box, filled with hay and dry mosses, by way of a bedchamber. As, however, such accommodation is not readily found, we will just describe the mode of making a very strong, sightly, and cleanly cage, at a comparatively small expense, and possessing the advantage of coming to pieces when needed, and being packed flat like a portfolio for removal. It will be much cheaper than a purchased cage, quite as handsome, and more easily cleansed.

[Ill.u.s.tration: FIG. 1.]

Make, or, if you are not a good workman, get a carpenter to make, a shallow wooden tray about two inches deep, lined with tin, which should be turned fairly over the edges, or sundry difficulties will appear in course of time. (See fig. 1.) Then go to a wire-worker's, and order him to make two frames of galvanized iron wire, like fig. 2, and two more like fig. 3, each being about half an inch shorter than the interior length and width of the tray, into which they are intended to fit easily. Also have another piece of similar wire made large enough to bend over the arched tops of the end-pieces, so as to make a roof like the transepts of the Crystal Palace. The edges of the side and end-pieces should be very stout, but those of the roof only moderately strong, or it will not bend easily. It will be better to have a square opening at each end, which should be closed by a door of similar materials. As this wirework will be of coa.r.s.e manufacture, and have tolerably wide intervals, the cost will be very moderate.

[Ill.u.s.tration: FIG. 2.]

After these frames have been procured, fit them together, and fasten them by twisting bits of wire round the edges at intervals of three inches or so. Put this frame into the tray, and the cage is complete.

The staples at the ends are useful for receiving the hooked end of a slight iron rod, looped at the other end to the edging-wire, as seen in fig. 4. These rods act as braces to keep the whole structure firm, and also hold it down to the tray. Some suitable sticks or branches should be fastened to the wires, as the squirrel is fond of playing about on them.

This is the day-room of the squirrel, and its bedroom is merely a proper-sized box, with wire-work subst.i.tuted for the wooden bottom, a hinged lid, and a hole cut in one end. This should be supported on four legs; a nail at each corner (not a bra.s.s-headed nail) will answer the purpose perfectly well. This box is simply placed in the tray at the back of the cage. If it can be managed, a duplicate tray will be exceedingly convenient, as the cage needs the extremest cleanliness, and can be simply purified by changing the tray every morning, washing very carefully the one just removed, and leaving it in the air till the next day. A duplicate sleeping-box will be equally serviceable. The box should be furnished with perfectly clean hay, mosses, lichens, &c.

[Ill.u.s.tration: FIG. 3.]

[Ill.u.s.tration: FIG. 4.]

The cage should never be less than two feet long, two high, and one foot wide. All should be thus particular about the size of the cage, because we hold it to be a cruel deed to take an active little creature like the squirrel from its fields and wide woods, where it can sport at will over unlimited s.p.a.ce, and coop it up in a close, evil-smelling, little cage, where its only exercise can be obtained by driving a wheel round, and its wonderful faculty of leaping wholly checked. How much wheel-work would the squirrel do if it had the choice of a tree or a wheel for its exercise? Even in a cage, provided it be of a proper size, the little creature would not trouble itself to get into a wheel, but prefer clambering about the wires, and jumping from one side to another, in the exuberance of its activity.

Many persons a.s.sert that the squirrel is quite fond of the wheel, and delights in driving it; but they forget that the poor little creature is driven to that as its last resource for needful exercise; and it no more delights in pulling a wire wheel than the caged lion and tiger delight in their restless pacing of their dens.

The exercise of the powers with which it is so liberally gifted is essential to the health of the squirrel, and its health must suffer if it be not permitted to leap. Look at it in a tree, and just see what astonishing jumps the pretty creature takes; how it will spring fairly from the ground to the trunk of a tree, making a jump of some six or seven feet in length and four in height; how it gallops up the perpendicular stem, with its tail laid behind it, like a fox's brush; how it scuttles up the branches, always contriving to keep the bough between itself and the spectator; and then how, when it has arrived at the topmost branch, and considers itself safe, it sits up in its own charmingly impertinent position, spreads its tail over its head, and looks down with a calmly supercilious contempt on the clumsy two-legged animal below, who cannot run up a tree, and has no bushy tail for a parasol.

No one who has once witnessed this sight could ever be guilty of such a cruel act as penning up a squirrel in a small cage, where it has no room to perform its pretty tricks; and if the reader cannot furnish his pet with a proper house, we earnestly dissuade him from keeping a squirrel at all.

Having prepared the house, the next business is to procure the inhabitant. Be ever wary of those wandering dealers who carry a squirrel about for sale in their arms, stroke its head, and put their fingers to its mouth to show its tameness. In almost every case the man is a cheat, and in many instances a cruel one.

The apparent tameness of some of these little creatures is caused by a small dose of strychnine, which renders the animal dull and spiritless, and is generally fatal in the course of a day or two; so that the disappointed purchaser finds his pet dead and stiff at the bottom of its cage before he has possessed it for many hours. Some of these men are said to employ a preparation of opium for the same purpose.

In cases where these impostors wish to sell an old and cross-grained squirrel as a gentle, young one, they pull out its front teeth, so that the poor creature not only cannot bite, but feels such pain in its jaws that it recoils whenever the cruel owner puts his finger to its mouth as a proof of its good education and gentle disposition. As all rodent animals depend solely on their beautifully-formed and chisel-shaped fore teeth for their subsistence, the unfortunate squirrel is unable to eat, and dies miserably of hunger.

Taking warning, therefore, of these hints, let every intending purchaser of a squirrel be very wary respecting the seller, and examine the squirrel's eye, to see if it be bright and lively, and its mouth, to see if the teeth be perfect. The age of the squirrel may also be known by its teeth: if young, they are nearly white; if old, of a deep yellow.

Squirrels when taken after they have reached their full age are nearly always vicious and ill-tempered.

The best way, therefore, to obtain a good squirrel is either to order it from a respectable dealer, who will be sure to supply a young and healthy animal, or to be independent of dealers, and take the creature out of the nest.