The dyeing of textile fabrics . hnumerous convolutions, the veritable secreting portion ;a central part (c b) somewhat expanded, and constitutingthe reservoir of thesilk substance; acapillary tube B A,connecting the re-servoir with a simi-lar capillary canalat A, common toboth glands, andsituated in the headof the animal,whence issues thesilk. The silk sub-stance as containedin the central re-servoir is a clear,colourless, gelatin-ous liquid. Accord-ing to Duseigneur,this is surroundedby a layer of anothersubstance, colour-less when the silk is white, coloured when it is yellow,and which possi
The dyeing of textile fabrics . hnumerous convolutions, the veritable secreting portion ;a central part (c b) somewhat expanded, and constitutingthe reservoir of thesilk substance; acapillary tube B A,connecting the re-servoir with a simi-lar capillary canalat A, common toboth glands, andsituated in the headof the animal,whence issues thesilk. The silk sub-stance as containedin the central re-servoir is a clear,colourless, gelatin-ous liquid. Accord-ing to Duseigneur,this is surroundedby a layer of anothersubstance, colour-less when the silk is white, coloured when it is yellow,and which possibly constitutes the silk-gum to bealluded to subsequently. The whole is enclosed in a thinmembrane. A transverse section (Fig. 14) shows that itoccupies a space equal to 20—25 per cent, of the totalvolume, a proportion which corresponds somewhat to theloss sustained by raw silk during the operation of boil-ing-off. Arrived in the capillary tube at A (Fig. 13), the silksubstance solidifies, and issues from the spinneret in the. Fig. 13.—Tlie Silk Glands of the Silkworm. 46 DIEIKG OF TEXTILE FABRICS. (Chap. IV. form of a douLle fibre, as represented in Fig. 15. Occa-Kionallj the two fibres ma}- be slightly separated at in-tervals, and form then at these points two transparentsolid cylinders. In the beginning of its spinning operations the silk- woiTQ throwsround about itself a lightscafiblding, asit were, ofsliort fibresconnecting theneighbouringpoints of sui>port Whenthis is completed its movements become slower, and bymoving its head from side to side it gradually forms andlines its dwelling: with numerous layers of what may betermed silken lattice-work. Towards the interior the layers become firmer and
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdyesanddyeing, bookye
