n of character in breeds of, ii. 66-67;
sexual differences in some varieties of, ii. 74;
period of perfect plumage in, ii. 77;
effect of segregation on, ii. 86;
preferent pairing of, within the same breed, ii. 103;
fertility of, increased by domestication, ii. 112, 155;
effects of interbreeding and necessity of crossing, ii. 125-126;
indifference of, to change of climate, ii. 161;
selection of, ii. 195, 199, 204;
among the Romans, ii. 202;
unconscious selection of, ii. 211, 214;
facility of selection of, ii. 234;
white, liable to the attacks of hawks, ii. 230;
effects of disuse of parts in, ii. 298;
fed upon meat, ii. 304;
effect of first male upon the subsequent progeny of the female, i. 405;
homology of the leg and wing feathers in, ii. 323;
union of two outer toes in feather-legged, _ibid._;
correlation of beak, limbs, tongue, and nostrils in, ii. 324;
analogous variation in, ii. 349-350;
permanence of breeds of, ii. 429.
PIGS, of Swiss lake-dwellings, i. 67-68;
types of, derived from _Sus scrofa_ and _Sus indica_, i. 66-67;
Japanese (_Sus pliciceps_, Gray), figured, i. 69;
of Pacific islands, i. 70, ii. 87;
modifications, of skull in, i. 71-73;
length of intestines in, i. 73, ii. 303;
period of gestation of, i. 74;
number of vertebrae and ribs in, i. 74;
anomalous forms, i. 75-76;
development of tusks and bristles in, i. 76;
striped young of, i. 76-77;
reversion of feral, to wild type, i. 77-78, ii. 33, 47;
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;
{471}
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;
crosses of, ii. 93, 95;
mutual fertility of all varieties of, ii. 110;
increased fertility by domestication, ii. 111;
ill effects of close interbreeding in, ii. 121-122;
influence of selection on, ii. 198;
prejudice against certain colours in, ii. 210, 229, 336;
unconscious selection of, ii. 214;
black Virginian, ii. 227, 336;
similarity of the best breeds of, ii. 241;
change of form in, ii. 279;