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M. Peligot furnishes some details respecting silk-worms. He shews that in every 100 parts of mulberry leaves, as supplied, the result is from 8 to 9 of worms, 36 to 40 of egested matters, and 45 to 46 of dry litter and waste.
For instance, a worm, which has no reproductive organs, is often found in the body of the stickle-back; this worm, however, is known to breed, but it does so only when the stickle-back happens to be eaten by a bird; the worm is then placed in the proper condition for development, 'for it is then only that its segments become filled with eggs, which, egested by the bird, pass into the bodies of other fishes; in a way more in accordance with natural operations than spontaneous generation.
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