influence of time on, ii. [243]-[244];
summary of subject, ii. [246]-[249];
effects of, in modifying breeds of cattle, i. 92, 93;
in preserving the purity of breeds of sheep, i. 99-100;
in producing varieties of pigeons, i. 213-218;
in breeding fowls, i. 232-233;
in the goose, i. 289;
in the canary, i. 295;
in the goldfish, i. 296;
in the silkworm, i. 300-301;