d-variation in, i. 385.
INCEST, abhorred by savages, ii. 123-124.
INCUBATION, by crossed fowls of non-sitting varieties, ii. 43-44.
INDIA, striped horses of, i. 58;
pigs of, i. 66, 67, 76;
breeding of rabbits in, i. 112;
cultivation of pigeons in, i. 205-206.
INDIVIDUAL variability in pigeons, i. 158-160.
INGLEDEW, Mr., cultivation of European vegetables in India, ii. 169.
"INDISCHE Taube," ii. 144.
INHERITANCE, ii. 1-84, 371-373, 395, 397-402;
doubts entertained of by some writers, ii. 3;
importance of to breeders, 3-4;
evidence of, derived from statistics of chances, 5;
of peculiarities in man, 5-7, 12-16;
of disease, 7-8, 17;
of peculiarities in the eye, 8-10;
of deviations from symmetry, 12;
of polydactylism, 12-16;
capriciousness of, 17-22, 27;
of mutilations, 22-24;
of congenital monstrosities, 24;
causes of absence of, 24-26;
by reversion or atavism, 28-61;
its connexion with fixedness of character, 62-64;
affected by prepotency of transmission of character, 65-71;
limited by sex, 71-75;
at corresponding periods of life, 75-80;
summary of the subject of, 80-84;
laws of, the same in seminal and bud varieties, i. 409;
of characters in the horse, i. 10-11;
in cattle, i. 87;
in rabbits, i. 107;
in the peach, i. 339;
in the nectarine, i. 340;
in plums, i. 347;
in apples, i. 350;
in pears, i. 351;
in the pansy, i. 369;
of primary characters of _Columba livia_ in crossed pigeons, i. 201;
of peculiarities of plumage in pigeons, i. 160-161;
of peculiarities of foliage in trees, i. 362;
effects of, in varieties of the cabbage, i. 325.
INSANITY, inheritance of, ii. 7, 78.
INSECTS, regeneration of lost parts in, ii. 15, 294;
agency of, in fecundation of larkspurs, ii. 21;
effect of changed conditions upon, ii. 157;
sterile neuter, ii. 186-187;
{459}
monstrosities in, ii. 269, 391.
INSTINCTS, defective, of silkworms, i. 304.
INTERBREEDING, close, ill effects of, ii. 114-131, 175.
INTERCROSSING, of species, as a cause of variation, i. 188;
natural, of plants, i. 336;
of species of Canidae and breeds of dogs, i. 31-33;
of domestic and wild cats, i. 44-45;
of breeds of pigs, i. 71, 78;
of cattle, i. 83;
of varieties of cabbage, i. 324;
of peas, i. 326, 329-330;
of varieties of orange, i. 336;