. 185-189, 224-233;
as the origin of species, genera and other groups, ii. 429-432;
circumstances favourable to, ii. 233-239;
tendency of towards extremes, ii. 239-242;
{477}
possible limit of, ii. 242;
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;
contrasted in cabbages and cereals, i. 323;
in the white mulberry, i. 334;
on gooseberries, i. 356;
applied to wheat, i. 317-318;
exemplified in carrots, &c., i. 326;
in the potato, i. 331;
in the melon, i. 360;
in flowering plants, i. 365;
in the hyacinth, i. 371;
applied to bud-varieties of plants, i. 411;
illustrations of, ii. 421-428.
SELECTION, sexual, ii. 75.
SELF-IMPOTENCE in plants, ii. 131-140;
in individual plants, ii. 136-138;
of hybrids, ii. 174.
SELWYN, Mr., on the Dingo, i. 26.
SELYS-LONGCHAMPS, on hybrid ducks, i. 190, ii. 46, 157;
hybrid of the hook-billed duck and Egyptian goose, i. 282.
SERINGE, on the St. Valery apple, i. 350.
SERPENT Melon, i. 360.
SERRES, Olivier de, wild poultry in Guiana, i. 237.
SESAMUM, white-seeded, antiquity of the, ii. 429.
_Setaria_, found in the Swiss lake-dwellings, i. 317.
SETTERS, degeneration of, in India, i. 38;
Youatt's remarks on, i. 41.
SEX, secondary characters of, latent, ii. 51-52;
of parents, influence of, on hybrids, ii. 267.
SEXUAL characters, sometimes lost in domestication, ii. 74.
SEXUAL limitation of characters, ii. 71-75.
SEXUAL peculiarities, induced by domestication in sheep, i. 95;
in fowls, i. 251-257;
transfer of, i. 255-257.
SEXUAL variability in pigeons, i. 161-162.
SEXUAL selection, ii. 75.
SHADDOCK, i. 335.
SHAILER, Mr., on the moss-rose, i. 379-380.
SHANGHAI fowls, i. 227.
SHANGHAI sheep, their fecundity, i. 97.
SHAN ponies, striped, i. 58.
SHEEP, disputed origin of, i. 94;
early domestication of, i. 94;
large-tailed, i. 94, 95, 98, ii. 279;
variations in horns, mammae and other characters of, i. 95;
sexual characters of, induced by domestication, i. 95, 96;
adaptation of, to climate a