[37] Variation of Animals and Plants under Domestication, i. 130, 135; ii. 288.
[38] Encyclopædia Britannica, article "Zoology."
[39] Variation of Animals and Plants under Domestication, ii. 367.
[40] Variation of Animals and Plants under Domestication, ii. 367. Why then does the cheetah inherit ancestral habits so inadequately that it is useless for the chase unless it has first learned to hunt for itself before being captured? (ii. 133).
[41] Descent of Man, p. 33.
[42] Origin of Species, pp. 210, 211.
[43] E. S. Delamer on Pigeons and Rabbits, pp. 132, 103. For other points referred to, see pages 133, 102, 100, 95, 131.
[44] Origin of Species, pp. 188, 110; Descent of Man, pp. 32-35; Variation of Animals and Plants under Domestication, ii. 289, 293. Use or disuse during lifetime of course co-operates, and in some cases, as in that of the canoe Indians, may be the principal or even perhaps the sole cause of the change.
[45] For the importance of panmixia as invalidating Darwin's strongest evidence for use-inheritance—namely, that drawn from the effects of disuse in highly-fed domestic animals where there is supposed to be no economy of growth—see Professor Romanes on Panmixia, Nature, April 3, 1890.
[46] Descent of Man, p. 33.