SILK CULTURE. A HAND-BOOK FOR srRER GRO MPERS. BY / Mrs. C. E. BAMFORD: t) NEW YORK: 5g 0. JUDD CO., DAVID W. JUDD, Prus’z, 751 BROADWAY. 1886. Entered, according to Act of Congress, in the year 1885, by DAVID W. JUDD, In the Office of the Librarian of Congress, at Washington. PREFACE. It is the purpose of this little hand-book to aid in creating an interest in silk-culture, and to afford a guide to those who desire to practically undertake raising the silk-worm. From a general study of the subject, from practical experience, and from many authentic sources, the facts here presented have been compiled ; and the writer de- sires that the dissemination of them may prove useful, and that the growing of raw silk in the United States may become general, and add to individual and national prosperity. CONTENTS. ; CHAPTER I. The Mulberry: ; .> 35. ge. oes ae.ee eee is parsaiais vies Bate nee 5 CHAPTER II. Gathering the, Leaves. o..:. 5... oc::sives Siok weet sae etal oan 8 CHAPTER III. The: COCOODErY..5:c.055 ote bon Pais eis wwe vin 3 Miers eee 10 CHAPTER IV. Eers of the Silk-Worm Moth: .:........2 .. v2 ane eas ob ene ns aes 13 CHAPTER V. Feeding the ‘Silk-Wormis: «20.254 <5 Si. S wat ee ecele tee ee 14 CHAPTER VI. WMoltinie. <2 oe. snptessire= sos sense Serta rine aie oivie sett eleete oe en 16 CHAPTER VII. Spinning <3. <.coxs epee Ce Re eo ey ee Pe I eye 18 CHAPTER VIII. The Cocoons: 2404 5 aot s sete ae Saas See kee ee ate 21 CHAPTER IX. The Moths of the Silk-Worm). 60.5 4~ ser =p toscase oe eee 23 CHAPTER X. Varieties of Silk-WOrnis 2 och. «00a st namie se ewe = eet oe etal = 5 eee 25 CHAPTER XI. Diseases of the Silk-Worm....... ce eee e escent erent eee e ences eae 26 CHAPTER XII. ONE O55 sie doles s aii mala oy bl EMSS eee Jllustrated.... 27 CHAPTER XIIL Chemistry Of Silk... 5 0.600 cnr eso vse oe he len here Oe ae aie 29 . CHAPTER XIV. Miscellaneous.....-« aa ae nae nid meee Ce rabievs On ee veueneawiee seawater: 30 (4) Sebie CHE LU RES CHAPTER I. THE MULBERRY. The first important work in practical silk-culture is, to provide an abundance of nourishing food for the future army of silk-worms. Worms fed upon the leaves of the Osage Orange, may produce inferior silk, and let- tuce or dandelion leaves may prevent the worms from perishing with hunger; but, unquestionably, the natural and proper food for the silk-worm, its ‘‘ staff of life,” is the Mulberry. The Mulberry tree is of the genus Morus, which com- prises perhaps a dozen species. The White Mulberry, Morus alba, stands at the head of the list, asit has proved more suitable for producing the finest silk, and for withstanding the frosts of winter, than most other species. The Morus muiticaulis is vigorous in growth; its leaves are coarse and large, and it is easily propagated from cuttings. The Morus Japonica, or Japanese Mulberry, stands the cold well, and its large leaf recommends it to the silk-grower. (5) 6 SILK CULTURE. An improved variety of Morus alba, called Morette elata, is said to endure hard frosts, and its large, thick leaves make it desirable. Cultivators differ in opinion in — regard to the value of the different varieties of the Mul- berry ; but the ‘‘ White” is generally preferred in Italy, and in the United States. Mulberry trees are in full bearing when four or five years of age. ‘They have the reputation of usually resisting the extremes of heat and cold. A sheltered position might aid in shielding the trees from frost, but their depth of root helps them to resist the drouth of summer. The Mulberry requires that the soil should be deep, light, and rich, and it seldom thrives well in clay or sand. Light, loamy soil, however, well plowed, and with a southern exposure, is favorable to the growth of the tree. For convenience in picking the leaves, the trees should be planted near the home of the silk-culturist, and they may be made useful as a hedge, or as shade trees, in any unoccupied space. Mulberry trees may be grown either from seed, or from cuttings; and grafting is sometimes practiced ; but some think, that trees not grafted, yield the best silk, al- though in smaller quantities. If trees are planted in rows, the rows may be ten or — twelve feet apart, some say eight feet apart, and the trees six or eight feet from each other in the row. When the plants are young, irrigation may hasten their growth; but freely-watered trees do not produce as rich material for making silk, nor are the leayes as nutritious or healthful for the worms, therefore water should be used sparingly. In Italy, the Mulberry is often planted in grain fields, or other cultivated lands, and about eighty trees allowed toan acre. The trees produce leaves for from fifty to one hundred years, according to the soil and climate. It is estimated that, in two or three years from planting, SILK CULTURE. 7 a tree will yield about ten pounds of leaves, and it requires twenty pounds or more of leaves, to produce one pound of silk cocoons. Cuttings may be six or eight inches in length, each having a bud or eye near the top. In rich soil, the cut- tings may be placed where they are expected to grow, and almost covered with earth. Weeds must be kept down, and the ground worked with plow or hoe. In planting a large grove of Mulberry trees, roadways should be left so that the leaves and branches need not be carried far by hand to a place of deposit. Mulberry trees left to themselves, usually grow to the hight of from twenty to forty feet ; but for convenience in gathering the leaves, the trees should be pruned, and not allowed to grow to a hight of more than ten or twelve feet.. This pruning may be done each year, or every other year, in the fall months, after the leaves haye fallen. The trees may be planted in either fall or spring, although the latter time is preferable. Ten or twenty trees are sufficient for a first experiment in silk culture, and the writer proved that three trees of two years’ growth, produced sufficient leaves for one hun- dred worms, from the time of hatching until they spun. One acre of land may easily contain four hundred trees, and feed the silk-worms from several ounces of eggs. Some one has estimated that a good rich acre can be made to yield food enough for one million silk-worms. But uo precise estimate can be made, because so much depends upon the number of trees to the acre, also the hight they are allowed to grow, the quality of soil, the climate, and the economy or prodigality of those who gather the leaves and feed the worms. It might pay the farmer to plant groves of Mulberry for the purpose of selling the leaves and branches to people in towns who desire to raise the silk-worms, but who have no land upon which to raise the necessary food. 8 SILK CULTURE. Millions of worms might be raised in this way in cities, and prove a benefit to both town and country. If it is desirable to raise trees in a nursery, the cut- tings may be placed four or five inches apart, and trans- planted the third year. When pruning trees, all dead branches should be re- moved and the trees kept in a trim and healthy state. The pale green of the Mulberry is pleasing to the eye, and the wood is good for fencing, and for use by the cabinet-maker. ‘The fruit which grows upon the Mul- berry is readily eaten by poultry, while cattle are said to thrive upon the green leaves. The work of gathering leaves from the Mulberry is not nearly so much as that required in picking the small leaves of the Osage Orange, and the price of silk made from Mulberry is greater than that from the Orange. CHAPTER II. GATHERING THE LEAVES. The tiny worms must be supplied with leaves imme- diately after hatching, or they will wander off and get ~ lost. Only small leaves, or tender larger leaves, should be gathered for the young worms. The reddish leaves must never be given to worms, as they sicken and injure them. Damp leaves must never be given to silk-worms of any size or ‘‘age.” In rain-storms, the leayes must be dried, or thoroughly wiped, before presenting them to the worms. Stale and withered leaves, the worms will never eat. Twigs and branches may be given to feed from, when the worms are older. A sufficient number of branches should never be taken from one tree, to disfigure or injure it. The SILK CULTURE. 9 branches should be taken off evenly, all over the tree, so that a good head may appear another season. ‘Trees are sometimes, however, wholly stripped of leaves, without apparent injury. Pruning-shears may be used for cutting twigs and branches. These branches need not be lost, for, with care in planting, they will grow after the worms have eaten the leaves. The worms dislike a flat surface, after they are of any considerable size, therefore the twigs and branches are more agreeable to them. They keep the worms from being crowded in among the débris, and allow them more air, of which they need an abundance. If kept as warm as they should be, the worms eat most freely early in the morning, and late at night; this is especially so with worms of the “‘fifth age.” Leaves for the morning should be gathered the night before, and kept in a cool room. If not gathered until morning, the leaves are covered, usually, with dew. Silk-worms are enormous eaters, and should not be stinted for food. Mr. Bonafoux estimated that one ounce of worms (forty- thousand) would eat leaves at the following rate : ENG TPB BEE ean 5.5 5 ies a oe 7 pounds of leaves. 6h SE RREOMG IEG: Dh oaia wais.c/ <1. ee 21 Sane ee (CG hIPd BOO? dei cen Uae wiles 69 Be ene Ae 66 CS TOE Cede og attra ae meses 200 Shae BEES oe SE Sher EE RGF eg acre faces ae 1,250 5s Fi han PPB ai trai Sarin Haven Dabuls 1,547 pounds of leaves. The weight of silk-worms is estimated by Count Dandolo as follows, for one hundred newly-hatched worms: WPEWONG Gir MR ccdc cm o's once ces oe oe wrasse 1 grain. PREP GSC OTE foo Goss 5a 5 sls Soke se sss 15 grains. OF nes See MIEN leo eae pn iv aps aie'n’aie aoe 3 4 « GOT) PERV, SEUNG cies as) ciate, vio ain ws aw ais 0s 400. 7s OOS EUPUE TEGAN ees viens = 2 we oes wis Be 4,628 ‘ Way SUAE. teats ietes «ahaa. ae acer ois esses 9,500 ‘ All this gain in weight is made in from thirty-two to thirty-five days. 10 SILK CULTURE. CHAPTER ITI. THE COCOONERY. The cocoonery, or feeding-room, may be large or small, according to the number of worms to be accommodated. In very warm countries, an airy, open building often serves the purpose, but a closed room is usually needed in the United States. An attic, or any unused room, will do, if it is dry, ight, and has good ventilation. It is stated that the peasants of Europe often clear out as many of their living rooms as possible for the few weeks necessary to raise the silk-worm, and then re-occupy them when the spinning of the worm is over. When houses are builf on purpose for the business, they should be twice as long as they are wide, with win- dows on each side for air and light; but the direct rays of the sun upon the worms should be avoided, as it will sometimes kill them. Upright frames may be made to hold the number of trays desired for the worms. The trays may be eighteen by twenty-four inches, with a border of seasoned wood, to prevent the worms from fall- ing off. They should be lined with paper, which should be changed daily. Perhaps a better way is, to use mos- quito netting for the bottom of the tray, supporting the worms and leaves by strong twine fastened to tacks beneath the netting. This netting must be taken off and aired often, other netting being supplied meantime. For the first two weeks, such a tray will answer for feeding eight hundred worms. As the worms grow very fast, care must be taken to place them on other trays, that they may not crowd too much. It has been estimated by an experienced silk-grower, that a room twenty-four feet by sixteen, and eleven feet in hight, from floor to ceiling, is sufficiently large for fifty-thousand worms, and that a man or woman, with SILK. CULTURE. 11 the help of several children, to pick the leaves, can care for that number with ease. A temporary cocoonery which the writer visited, was in charge of one man, who with the aid of children, was raising seventy-five thousand silk-worms. There were four or five wooden frames, extending nearly the length of the room, with aisles between the frames, and in hight the frames nearly reached the ceiling. The silk-worms were feeding and resting upon cheese-cloth shelves, which were about four or five feet in length, by three wide. The cloth shelves were supported by strong cord, stretched lengthwise and then crosswise beneath them, the cord being fastened to the framework at the sides and ends. Boards for shelves are not used. Coarse cloth or netting allows the worms purer air. There were three or four cloth shelves to the length of one frame, and they were also placed one above another to the number of four, leaving a space between a, them, to allow the attendant to easily feed and Ne care for the worms. ‘The silk-worms were in all stages of growth. Upon a later visit, the chil- dren were picking the cocoons and stripping off the floss-silk, and then dropping the cocoons into baskets. Many silk-worms were spinning upon rough frames, or upon dry branches of oak. Each frame was made of three ordinary laths, of the usual length, and in the shape of a triangular prism. ach side of the triangle, at each end of the laths, was about four inches in length. The roughness of the laths seemed to aid the worm in attaching its silken threads. The frames were made as an experiment, but found to work well. They were fastened to the corners of the cloth shelves, the lower ends resting on the shelves. When the spinning was over, the frames were easily taken down, and the cocoons removed from them. FRAME. 12 SILK CULTURE. When only a few worms are raised, just for experi- ‘ ment, two or three trays or shallow paste-board boxes upon a table in the corner of a sitting-room, are all that need be required. Fifty worms raised thus, m a family of growing children, may awaken in the ‘‘dull boy” a taste for natural history, which books alone could not do; and the mother may lead the child to adore the wisdom of God, who so fashioned the silk-worm that it can make silk from a green leaf. One authority, Count Dandolo, has estimated, that the space needed by one million silk-worms, is as follows: The. fipb, One,” Jc ceases 200 square feet of surface. mt 6 RECORE AEE, se oe 375 wa “ = Be At hird ae," < Le -iee ne 875 rs 4! s Me AC TOUSEN Be, sive rece 2,062 sad ef “é ©. GER GEES eu ac Hee OOD ~ € 4 Thus requiring a cocoonery of two stories to be thirty- five by seventy feet. It is stated that in China the cocoonery is often but a bamboo house, with curtained windows, standing at one end of a silk farm, and the trays resemble little sieves, which stand upon upright frames. The little girls are early taught to pick the Mulberry leaves from the many rows of low trees, and carry them in baskets to the cocoonery, where they quietly feed the worms, and learn how to care for the silk-worms at a very early age. SILK CULTURE. 13 CHAPTER IV. EGGS OF THE SILK-WORM MOTH. The eggs of the moth are nearly round in form, slightly indented on the faces, and about the size of the head of acommon pin. At first they are yellowish in color, but when fertilized, they become in a few days or weeks, of a grayish hue, or sometimes of a lilac or greenish color, according to the variety of the silk-worm. The eggs are usually called by silk culturists, ‘‘ seeds,” or “grain.” The ‘‘grain” is preserved upon portable substances, such as cloth or paper, to which the eggs adheres by means of a natural gluey substance, or gum. The eggs should be kept in a very cool, dry room, at, say, thirty or forty degrees, or lower, until the Mulberry puts forth its leaves, thus signaling that the hatching season draws nigh. Then the eggs should be introduced very gradually into a warm temperature, until seventy-five or eighty degrees are reached, when they will gradually hatch in from three to ten days. The ‘‘annual” worms hatch usually in April or May. There should be some means of keeping the cocoonery or feeding-room, at from seventy- five or eighty degrees, night and day, during the whole existence of the worm. As the time approaches for hatching, the eggs become lighter in color, a very slight clicking sound may usually. be heard from within, and early some morning the tiny worms begin to crawl out of their little prisons. Without experience, one would suppose the white egg contained a white worm, but no; out they come, one after another, and all are as black as night, and are looking about for food. . The just hatched silk-worms are but one or two lines in length, but their growth is very rapid. All worms 14 SILK CULTURE. that hatch upon a single day, should be kept by them- selves, and not placed in the same tray or on the same shelf with those hatched the day before. Otherwise, the worms will not all moult at the same time, and the feed- ing worms will disturb those that are sleeping. It is estimated that one ounce of eggs, or forty- thousand worms, will produce one hundred pounds of fresh cocoons, or thirty pounds of stifled, dried cocoons. Growers should raise their own eggs for ‘‘ seed,” and the eggs must be free from disease, or the worms will prob- ably die. Should disease break out, the sick and dead worms must be destroyed, and the trays thoroughly washed, scalded, and diluted carbolic acid, or fumigation may be used for cleansing the trays. CHAPTER V. FEEDING THE SILK-WORMS. The amount of silk produced by silk-worms depends largely upon the quantity and quality of food they con- sume, from which to manufacture the silk. Therefore it is of the greatest importance that leaves of the proper kind, and in sufficient quantity, should be within their reach at all times. Six, or even eight, times during the twenty-four hours, fresh food should be placed before the worms. ‘They rather skillfully gnaw the leaves in little circles, and sometimes leave only the skeletons behind. Leaves that are dusty, must be cleaned before feeding them to the worms, and the greatest care is necessary in regard to cleanliness, and in respect to good ventilation and an even temperature in the feeding room. Draughts should be avoided, and food should never be laid over the silk-worms in such a manner that they will suffocate SILK CULTURE. 15 from want of fresh air, or become crushed from the weight of leaves. A good way is, to lay the branches lengthways and crossways. Dried leaves and excrements, also the cast-off skins, should be removed from the trays daily, and no tobacco- smoke or other unpleasant odors allowed to penetrate the feeding-room. Dead or diseased worms must be burned, that their presence may not injure the healthy worms. Some worms will die at every moult, and will be found among the dried leaves and litter. It should be very strongly im- pressed upon all silk culturists, that extreme cleanliness and great care, are necessary to the health of silk-worms. It is not well to handle silk-worms; but when it is necessary to remove them from one/tray to another, it may best be done after they have crawled upon fresh branches. In feeding, when the worms are small, mos- quito netting may be placed over the worms, and fresh Mulberry leaves upon the top of it. The worms will soon crawl through the meshes to the fresh food; then they may be removed on the netting to a clean tray, and the litter cleaned from the one the worms have left. When the worms are larger, paste-board, or paper per- forated with sufficiently large holes for the worms to crawl through, may be substituted for the netting. Leaves of peach, or any other kind of fruit tree, must never be carelessly mixed with the Mulberry leaves. Some fruit trees leaves are poisonous, if fed to and eaten by the worms. Insects, such as ants, and spiders, must not be allowed in the feeding-room, and birds, rats, and mice, will devour silk-worms or cocoons, if possible. A thermometer is necessary in regulating the tempera- ture of the feeding-room. Well-fed worms, and those kept at a temperature of seventy-five degrees, will mature quicker and are less liable to disease, than those that are 16 SILK CULTURE. but half-fed and kept in a colder room of sixty degrees. However, the heat should never exceed eighty degrees. If worms have sufficient food, they are not disposed to wander away from it, excepting when they are just ready to spin their cocoons. | A company of ‘‘ fifth-age ” worms, while feeding, make a low, munching sound with their strong jaws, which may be heard across a large room. But, as they make no other audible sound during life,*this noise is rather pleasant than otherwise. No mouldy odor should cling to the trays, or be allowed in the feeding-rooms. OT APT BeWL MOULTING. The moulting time is a serious period in the lives of the worms. It is very important that sharp, quick noises should be avoided in the feeding-room, and that no un- usual sounds should be heard by the little sleepers. Severe thunder-storms have been known to so frighten them at the time, that they have perished. Silk-worms pass through four sleeping spells, or moults. In four or five days from hatching, they crawl upon an elevated portion of a leaf, fasten themselves by the hind- most legs, raise their heads in the air, and remain in this position, if not disturbed, for from twelve to thirty hours. When they awake, they leave their black coats upon the dried leaves, and come out dressed in lighter colored ones. Their coats are lighter after each successive moult, and after the last one, is of a yellowish-white color. The skins that are cast, often preserve the shape of the head, legs and other parts of the body, so much so, as SILK CULTURE. ih sometimes, in the fourth moult, to be mistaken for the worm itself. These skins should be destroyed with the rest of the litter. Doubtless, the silk-worms feel relieved on getting out of the old skins that have become too small for them, and after each moult they hasten to their Mulberry food with increased appetite. ’ The periods between the moults are called ‘‘ ages,” therefore a silk-worm is spoken of as being in the ‘‘sec- ond age,” “fifth age,” etc. The length of the ‘‘ages” vary from five to seven days, however; the ‘fifth age,” or last one, is nine or ten days long. Moulting should not be mistaken for disease ; some- times the worm may turn of a dark color and appear sick, before sleeping. These stated periods are usually given as follows : From hatching to the first moult........ from 5 to 6 days. i first to sGcond- MOUIt.. 0. sccesces set RS ame ‘second to third moult, .i....6.... yee ee Pir sbO: fOUTEE THOME. 6:5 ar acs. syeo <% Gin a5 ‘© fourth moult to spinninpg ......... from’ to 10" In too cold a temperature, the life of the worm may be prolonged several days, but the usual length is from thirty-two to thirty-five days. From hatching, until the cocoons are all dry enough for the filature (or reeling), 1s a period of about three months. The fourth moult is the most serious, and silk-worms that have not had good previous care, are likely to die at this time, 18 SILK CULTURE. CHAPTER VII. SPINNING. At length, at the end of from thirty-two to thirty-five days, the silk-worm is fully grown. It is now three inches or more in length, of a greenish or yellowish-white | color, with dark markings, and a fleshy protuberance on the last joint but one. Its body has twelve segments, nine stigmata or breathing holes on each side, and a double row of legs, numbering sixteen in all. Although the worm has so many legs, it finds use for them all when it begins to spin. While some support its body, other legs are used, sailor-like, in hauling the silken ropes in a skillful manner. The anterior six legs are hooked, while the others end off in disks. The mouth is opened vertically, and the jaws are serrated (saw- toothed), and very strong. A day or two before the worm commences to spin its cocoon, its desire for food abates; it nibbles the leaves without seeming to have an appetite for them ; it is rest- less, and runs hither and thither, looking upward fre- quently as though searching for a quiet haven among the branches to weave its nest, and then, wrapping ‘‘ the drapery of its couch about itself, ies down to pleasant dreams.” | The worm should now be provided with something to spin in, or upon, and many things will answer for the purpose. Clean bunches of straw, set upright, twigs, and small bundles of tree-branches two or three feet long, may be laid upon the shelf ; paper cones, or small, square pasteboard boxes may be used for them to spin in. On finding itself within a limited space, in a cone, for instance, where the walls may be touched on all sides by its head, the worm carefully inspects every corner, and, at length, with an air of satisfaction, fastens its first Sri CULTURE. 19 silken rope, as a guy, to a selected spot. The silk issues from two ducts situated one on each side of the jaws of the worm. The vibratory motion of the head, causes the two threads to unite and appear to the unaided eye like a single thread. The worm twists its body in the shape of the letter S, while spinning, and it is not long in attaching its threads to all sides of its new cell. Within this outer floss-silk i3 spun the cocoon. Gradually, the worm is hidden from sight, and in from three to five days the cocoon is finished. While spinning, the worms should be kept separate, that they may make no double cocoons which cannot be reeled. However, they are just as good for seed. No draughts of air should come upon the worms while spinning, lest the fluid from which the silk is formed may congeal, and interfere with this important work. ‘The temperature should be kept up the same as _ when they were eating, at seventy-five or eighty degrees. The cocoon is made entirely of silk, covered with a yel- lowish gum. The silk threads of cocoons are of different lengths, but are usually one thousand or twelve hundred feet in length, as found by measurement in reeling. When finished, the cocoon is an inch or more long, of a white, green, or yellow color, according to the kind of silk-worm. On account of its being covered with a gummy substance, the cocoon is impervious to cold water. This provision was necessary in the native state of the worm, to protect it from injury by the rain. The cocoon is not so long as the worm was before spin- ning, because in part, of its having spun itself away, and in part, because the worm, as it spins, curls itself up al- most double. The yellow cocoons resemble in size and color the common peanut ; the depression in the center of many cocoons is also very similar to that in the center of the shell of the peanut. The worms that do not commence spinning so quickly 20 SILK CULTURE. as the majority have done, should be placed in another tray and still fed. There are always some laggards, and they should be protected from the greenish fluid usually discharged by worms before spinning. Silk-worms are very docile until spinning time comes ; then they wish to select their own places for spinning, but with a little care they are easily controlled. The worms do not wind the silk round and round the cocoon, as silk is wound on a spool; but when spinning, their heads are moved back and forth from right to left, and, vice versa, from left to right, constantly ; in this way they nicely fold the silk in the shape of the figure 8. The worm gradually hides itself from view as it spins inside of its cocoon, and in about three days the spinning is completed and the worm then changes into a chrysalis. A very ornamental bouquet, for displaying at fairs, etc., may be made from cocoons. One seen by the author, recently, had as a base a board of about two feet in length, | by one in width. Perhaps one hundred holes in the board were filled with leafless tree branches, about three feet in length, standing upright. Silk-worms had been induced to spin their cocoons all over and through the branches, fastening them together with the silken floss, and pre- senting a beautiful bouquet, designed by man, but orna- mented by the silk-worm. fifteen hundred cocoons were clinging to these branches by silken cords. Two other bouquets of smaller size, made in like manner, stood upon either side of the large bonquet, and golden, shining skeins of silk, together with numerous spools of silk, in all colors, were on exhibition, thus presenting a novel spectacle, and one of which any silk culturist in the United States might justly be proud. In all cocoons there aré three or four distinct layers of silk of different degrees of fineness. Some think that these correspond to the four moults of the worm. SILK CULTURE. 21 Cee bee de VL TT, THE COCOONS. In a few days the cocoons harden, and good ones have a firm feeling when handled. Those intended for raising eggs should be stored away in a safe place, but not entirely excluded from air. The lightest-colored and firmest cocoons are usually best, and an equal number of each sex should be selected, if possible, for eggs. The female cocoon is generally larger, and more round in form, while the male cocoon is slender, pointed some- what at the ends, and depressed in the middle. When the cocoons are intended for reeling, the moths must not be allowed to pierce the ends, for this would tear the threads and so injure the silk that it could not be reeled off. If the reeling cannot be done immediately, it is necessary to ‘‘stifle,” or destroy, in some way, the lives of the poor little prisoners. Stifling is generally done by dry heat, or by means of steam. Heating them in an oven, will surely kill them ; but it is thought that dry heat injures the glossy appear- ance of the silk, therefore steam is oftener resorted to for this purpose. It takes one hour; but a half hour more will be more likely to insure success. The cocoons are placed in a wicker basket, covered with thick flannel, and suspended just above a vessel of boiling water (a wash boiler will answer), until the chrysalides are all killed. Then the cocoons must be spread out to dry, in a shady place, where the air is good, and where there is no danger from insects or mice, and they must be stirred and turned occasionally, until dry. In three or four weeks the cocoons may be gathered, tied up in coarse bags, and sent to the filature-or hung up inadry place. When shaken, the dry cocoons may be heard to rattle like peas ina pod. When one is opened, a homely specimen of 22 SILK CULTURE. ratural history is presented. It little resembles the white worm that entered the cocoon. Indeed, the chrysalis reminds one of an Esquimaux child, swaddled up from head to boots in a dress of one piece. It is difficult to cut open a cocoon with a case knife, because the silk is strong and covered with gum. Scissors will, however, cut one open very readily. Never shake a cocoon that is intended for seed. Care should be taken not to crack or dent the cocoons that are to be reeled. In gathering them from the place where they have spun, pick off the outer floss silk. This is called ‘‘stripping.” The floss silk and ‘* pierced” co- coons may be sold for poor silk. ‘The pierced cocoons are those that have been opened at one end by the moth, when coming out. In gathering, keep the dark and stained cocoons sep- arate from others. Where the insect has died, the cocoon is sometimes discolored, and may be burned. Soft co- coons should also be rejected, as in packing they may break and injure others. Un-pierced cocoons are usually sold at from one dollar to one dollar and a half per pound. All cocoons in- tended for market, must be properly stifled and well dried, or great loss may be experienced from mildew. Expense is avoided in shipping cocoons by packing in coarse bags, but barrels or boxes may be used for the purpose ; and, if sent by express, all expenses should be prepaid. Gum camphor, or some insecticide may be used in packing cocoons for market. SILK CULTURE. 23 ase TE RT Xx. THE MOTHS OF THE SILK-WORMS. In from ten to twenty days from spinning, the cocoons that were reserved for ‘‘seed,” begin to show signs of life within. The prisoner moistens one end of its cocoon with 2 secretion provided for the purpose, and generally breaks through the cocoon in the forenoon ; it then comes forth as a moth, with wet, limp wings. The moths appear in greatest numbers from five to nine o’clock in the morning: they should be placed upon paper and left to dry and rest for a short time, the sexes being kept separate. The moths now look no more like the former silk- worms that spun the cocoons, than did the swaddled-up chrysalides. The moth is of a creamy or grayish-white color, with brownish markings across the wings. It has four wings ; it has no desire to spin, and the former appetite for Mul- berry leaves has departed. After a short time, when the wings are thoroughly dried, the moths should be placed upon clean paper or muslin, upon a flat surface. If the eggs are intended for sale, this paper or muslin should be previously weighed and the accurate weight marked upon one side ; then, after the eggs are upon the paper and have dried a few days, the paper or muslin should again be weighed and marked, when the difference between the markings will show the weight of the eggs. The male moth is smaller and more active than the female, and keeps up a constant flutter with his wings, but neither sex attempts much flying. That the eggs may be impregnated, an equal number of the sexes should be placed upon the paper together, for six or eight hours, in a darkened room. Superfluous 24 SILK CULTURE. males should be placed in a box, to await the females that may appear the next morning from the cocoons. At the end of six or eight hours, the sexes should be separated, and the females alone left in possession of the paper in the dark, for twenty-four hours, during which time they will lay their. eggs. Hach female lays from two hundred to four hundred eggs, perhaps averaging three hundred. The yellow eggs gradually turn to a drab or grayish color, if impregnated ; but if they remain of the original color for a month, they are probably worthless for seed, and may be destroyed. The moths live three or four days, sometimes a week longer, and then die of old age in less than three months from their own birth, from the tiny eggs. If the eggs are not to be sold, they should be kept through the winter in perforated tin cans or boxes; the holes should be covered with fine wire cloth, to keep out insects. The perforation is to give necessary air to the eggs that would probably become worthless in air-tight vessels. The eggs must be kept inacool place. Even with the thermometer down to nearly freezing point, the eggs are said to be uninjured. But do not freeze them. Premature hatching must be avoided ; that is, before the Mulberry leaves are ready for food, the box of eggs must be kept on ice, if necessary, to prevent hatching too early in the spring. But do not place them on ice when they have begun to hatch, or it will kill them. There should be no dampness in the room, closet, or cellar where the eggs remain, and the eggs should be looked after occasionally, to see that no insects have got within the box or tin, or that no mould is destroying the eggs. Keep up the temperature while the moths are lay- ing their eggs. When necessary to remove moths, do so by taking hold of the wings carefully. SILK CULTURE. 25 CITA Pile RX. VARIETIES OF SILK-WORMS. The worm that feeds upon the Mulberry was originally derived from the -northern provinces of China. But changes have been made by climate, food, and artificial surroundings to such a degree, that there are at the pres- ent time varieties of silk-worms that vary in respect to the color and shape of their cocoons, in regard to the quality of silk produced, and in the number of broods produced each year. Among the different varicties are the Annuals, Bi- voltines, Trivoltines, Quadrivoltines ; producing one, two, three, and four broods each year. It is generally conceded that the annuals, are the most profitable for silk growers. The Bivoltines produce two broods, but the second brood is seldom raised, because the eggs hatch at a time when Mulberry food is scarce. The Trivoltines are said to moult but three times, instead of four, as is usual with the annuals. Varieties are often named after the countries where they thrive best. Among these are the French, producing yellow and straw-colored, large cocoons; Italian, a smaller, but fine, yellow cocoon ; Chinese, a white cocoon ; Japanese, green and white in color ; Turkish, producing in Europe the best kind of white cocoons. rv The most healthy and most vigorous varieties of silk- worms produce yellow or straw-colored cocoons; but white ones are considered more valuable in commerce. A silk grower must select the variety which he prefers ; but for beginners, probably the yellow-colored cocoon igs preferable. 26 SILK CULTURE. CHAPTER AI. DISEASES OF THE SILK-WORM. Probably every animal, insect, or worm that walks, flies, or crawls, is subject to disease in some form, and the silk-worm is no exception. Some of these diseases are caused by too great heat, others by cold, while some are hereditary. One of the worst diseases that the French silk growers have had to contend with, is ‘‘ Muscardine.” The losses in some years, in French cocooneries, have been estimated at one-sixth of the profits. The worms, in this disease, become a dullish white, the bodies become soft, and all the movements of the worms are sluggish, and they soon die. Bassi, an Italian, found the disease to be due to the attack of a fungus. ‘‘ Pebrine,” another scourge, is hereditary. It is called Pebrine on account of the dark spots which appear on the worms, ‘‘peppering” the skin. This disease has been compared to the Asiatic cholera, and it may become con- tagious and infectious ; it was unknown until the year 1842. Another disease, called Flacherie, is supposed to be caused by fermentation of food in the stomach of the worm, resulting in the development of fungi. There are other diseases; but as no silk-worm physician has yet appeared who could cure these silk-worm patients, a long list of diseases can be of no practical benefit. Those enumerated are considered the most fatal. Much, however, may be accomplished by silk growers in preventing disease. ‘The first thing is, to preserve none but healthy eggs, and then by great care, good ven- tilation, cleanliness, and plentiful food, to keep the worms in a healthy state. SILK CULTURE. Q7 CH-.4. PVT ER XLT. REELING. Great skill is required to reel silk in a proper manner. This labor may be performed at home; but, in order to have the silk marketable, this work should be done by trained reelers. Where there are ‘