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p. 364 B, unless they combine and this increase each other's bulk.

p. 364 C and generally undergoes a limited degree certain amount of, independent development. Finally we have Sexual & asexual reproduction are thus seen that sexual and not to differ essentially; & we have already shown that asexual reproduction, the power of regrowth repair of injuries. and development are all parts of one and same great law.)

p. 364 D, (add to note (12)) Weijenbergh also raised (Nature, Dec. 21. 1871. p. 149) two successive generations from unimpregnated females of another lepidopterous insect, Liparis dispar. These females did not produce at most one twentieth of their full complement of eggs: and many of the eggs were worthless.

Moreover the caterpillars raised from these un=

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fertilized eggs "possessed far less vitality" then those from fertilized eggs. In the third parthenogenetic generation not a single egg yielded a caterpillar.

p. 364 zz

Regrowth of amputated parts. This subject deserves a little further discussion. A multitude of the lower animals and some vertebrates possess this wonderful power. For instance Spallanzani In index cut off the legs and tail of the same salamander six times successively, in index and Bonnet *(35) did so eight times; and on each occasion the limbs were reproduced on the exact line of amputation, with no part deficient or in excess. An allied animal, the

[snippet of reference pasted on:] Spallanzani, "35 An essay on 'Animal Reproduction," translated by Dr. Maty, 1769, p. 79.

36 Bonnet,Œuvres d' Hist. Nat.,' tom. v., parti., 4to. edit., 1781, pp. 343, 350,