Hummel, J. J. (John James), d. 1902 · London : Cassell · leaf 61
Pig. 15.—Microscopic Appearance of Raw Silk Fibre. denser, while the innermost one, which immediately pro-tects the animal, forms a thin parchment-like skin. Theegg-shaped product is called a cocoon (Fig. 16). It ismade up of a double fibre, only rarely broken, varyingin length from 350 to 1,250… … Chap. TV.] SILK COCOON. 47 towards the interior, owing to the exhaustion of the cater-pillar from want of food during the spinning process. The cocoons are white or yellow, contracted in thecentre, about 3 centimetres long, and 1 5—2 centimetresthick. As soon as the metamorphosis of the caterpillar…
Dyes and dyeing
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