Hummel, J. J. (John James), d. 1902 · London : Cassell · leaf 58
^ regular intervals of four to six days. Onor about the thirtieth day the animal ceases to take food,and evinces a restless activity. At this period it is placedon birch twigs, tfcc, where it soon begins to spin- … Fig. 12.—Silkworm on Mulberry Leaf. Chap. IV.j SILK GLANDS OF THE SILKWORM. 45 The silk substance is secreted by two glands symmetri-cally situated on each side of the body of the caterpillar,below the intestinal canal. Each gland, as shown inFig. 13, consists of three parts : a narrow tube IC…
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