The dyeing of textile fabrics . )lants. In some districts it is reared by the cocoons, which are much larger than those ofBomhyx mori, are egg-shaped and of a silvery drabcolour. They are attached to the twigs of the food-treesby a peduncle having a terminal ring. The outer silkis somewhat reddish, and consists of separate fibres ofvarious length, while the rest is generally unbroken tothe centre of the cocoon. The cocoon is extremely firmand hard, the fibres being cemented together by apeculiar secretion of the animal, wl*ich permeates thewhole wall of the cocoon^ and imparts to i
The dyeing of textile fabrics . )lants. In some districts it is reared by the cocoons, which are much larger than those ofBomhyx mori, are egg-shaped and of a silvery drabcolour. They are attached to the twigs of the food-treesby a peduncle having a terminal ring. The outer silkis somewhat reddish, and consists of separate fibres ofvarious length, while the rest is generally unbroken tothe centre of the cocoon. The cocoon is extremely firmand hard, the fibres being cemented together by apeculiar secretion of the animal, wl*ich permeates thewhole wall of the cocoon^ and imparts to it its drab colour. 52 DYEING OF TEXTILE FABRICS. [Chap. IV. Tussur silk is used for the manufacture of the well-kuo-w-n drab or bufl^^oloured Indian silks. The cocoonsare boiled and carded, or even reeled, although this latterpix>cess jjresents difficulties. Silk plush is largely madefrom carded Tussur silk. Other wild silks are, Uria silk, fi-om Attacus ricini;Muga silk, fixjm Anihercea assama; Atlas silk, from. Pig. 18.—Microscopic Appearance of Tussur Silk Fibre. Atfacifs atlas : Yama-mdi silk, from the Antheraia yamormai of Japan, kc. Under the microscoi>e a raw mulberrj-silk fibre ap-pears as a double fibre (Fr. hare) consisting of two solidstructureless cylinders (Fr, brin), more or less unitedtogether (Fig. 15); after boiling-ofi with soap, how-ever, this double fibre separates into a pair of distinctfibres, ha^^llg a more or less irregulai, somewhat roundedtriangular section-Wild silk is distinguished fi*om mulberry silk by thelongitudinal striations seen in each of the double fibreswhen under microscopic examination (Fig. 18), and by the Chnp. TV.) SCROOP. 53 apparent contraction of the fibre at certain points. Theformer are due to the fact that the wild-silk fibre is com-posed .of a large number of fibrils, while the latterappearance is seen because the more or less flattenedfibres are twisted at the contracted points. 42. Physical Properties.—The most impor
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdyesanddyeing, bookye
