. -by the ancients and semi-civilised people. -of trifling characters. -unconscious. -effects of, shown by differences in most valued parts. -produced by accumulation of variability. -natural, as affecting domestic productions. -as the origin of species, genera, and other groups. -circumstances favourable to. -tendency of, towards extremes. -possible limit of. -influence of time on. -summary of subject. -effects of, in modifying breeds of cattle. -in preserving the purity of breeds of sheep. -in producing varieties of pigeons. -in breeding fowls. -in the goose. -in the canary. -in the gold-fish. -in the silkworm. -contrasted in cabbages and cereals. -in white mulberry. -on gooseberries. -applied to wheat. -exemplified in carrots, etc. -in potato. -in the melon. -in flowering plants. -in the hyacinth. -applied to bud-varieties of plants. -illustrations of.
SELECTION, sexual.
SELF-IMPOTENCE in plants. -in individual plants. -of hybrids.
SELWYN, Mr., on the Dingo.
SELYS-LONGCHAMPS, on hybrid ducks. -hybrid of the hook-billed duck and Egyptian goose.
SERINGE, on the St. Valery apple.
SERPENT melon.
SERRES, OLIVIER DE, wild poultry in Guiana.
SESAMUM, white-seeded, antiquity of the.
Setaria, found in the Swiss lake-dwellings.
SETTEGAST, sheep poisoned by buckwheat.
SETTERS, degeneration of, in India. -Youatt's remarks on.
SEX, secondary characters of, latent. -of parents, influence of, on hybrids.
SEXUAL characters, sometimes lost in domestication.
SEXUAL limitation of characters.
SEXUAL peculiarities, induced by domestication in sheep. -in fowls. -transfer of.
SEXUAL variability in pigeons.
SEXUAL selection.
SHADDOCK.
SHAILER, Mr., on the moss-rose.
SHAN ponies, striped.
SHANGHAI fowls.
SHANGHAI sheep, their fecundity.
SHEEP, disputed origin of. -early domestication of. -large-tailed. -variations in horns, mammae, and other characters of. -sexual characters of, induced by domestication. -adaptation of, to climate and pasture. -periods of gestation of. -effect of heat on the fleece of. -effect of selection on. -"ancon" or "otter" breeds of. -"Mauchamp-merino." -cross of German and merino. -black, of the Tarentino. -Karakool. -Jaffna, with callosities on the knees. -Chinese. -Danish, of the Bronze period. -polydactylism in. -occasional production of horns in hornless breeds of. -reversion of colour in. -influence of male, on offspring. -sexual differences in. -influence of crossing or segregation on. -interbreeding of. -effect of nourishment on the fertility of. -value of, crossbred. -diminished fertility of, under certain conditions. -unconscious selection of. -natural selection in breeds of. -reduction of bones in. -individual differences of. -local changes in the fleece of, in England. -partial degeneration of, in Australia. -correlation of horns and fleece in. -feeding on flesh. -acclimatisation of. -mountain, resistance of, to severe weather. -white, poisoned by Hypericum crispum.
SHEEP dogs, resembling wolves. -mutilated tail inherited.
SHELLS, sinistral and dextral.
SHIRLEY, E.P., on the fallow-deer.
SHIRREFF Mr., new varieties of wheat. -on crossing wheat. -variability of wheat. -continuous variation of wheat.
SHORT, D., hybrids of the domestic cat and Felis ornata.
SIAM, cats of. -horses of.
SIBERIA, northern range of wild horses in.
SICHEL, J., on the deafness of white cats with blue eyes.
SIDNEY, S., on the pedigrees of pigs. -on cross-reversion in pigs. -period of gestation in the pig. -production of breeds of pigs by intercrossing. -fertility of the pig. -effects of interbreeding on pigs. -on the colours of pigs.
SIEBOLD, on the sweet potato.
SIEBOLD, CARL VON, on parthenogenesis.
Silene, contabescence in.
SILK FOWLS.
SILK-MOTH, Arrindy. -Tarroo.
SILK-MOTHS. -domesticated, species of. -history of. -causes of modification in. -differences presented by. -crossing of. -disease in. -effects of disuse of parts in. -selection practised with. -variation of. -parthenogenesis in.