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The silkworm when first hatched is about a quarter of an inch long. After eight days' feeding, it prepares to change its skin. It throws out filaments of silk, attaching its skin to adjacent objects, becomes sluggish, raises the forepart of its body, and finally the whole outer case is cast off, including the feet and jaws. The newly moulted worm is pale in colour, but speedily regains its appetite, which had failed previous to the change, and it swells so fast that in five days another uncasing becomes necessary. Four of these moults and renewals of the skin bring the caterpillar to its full size, when its appetite becomes voracious, and the succulent parts of the mulberry leaf disappear with