production and changes of breeds of, by intercrossing, i. 78;
effects produced by the first male upon the subsequent progeny of the female, i. 404;
two-legged race of, ii. [4];
polydactylism in, ii. [14];
cross-reversion in, ii. [35];
hybrid, wildness of, ii. [45];
monstrous development of a proboscis in, ii. [57];
disappearance of tusks in male under domestication, ii, 74;
solid hoofed, ii. [429];