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Sexual characters, secondary; relations of polygamy to; transmitted ftp download through both sexes; gradation of, in birds.

Sexual selection, explanation of; influence of, on the colouring of Lepidoptera; objections to; action of, in mankind. Sharpe, R.B., on Tanysiptera sylvia; on Ceryle; on the young male ftp download of Dacelo Gaudi-chaudi.

Sheep, danger-signals of; sexual differences in ftp download the horns of; horns of; domestic, sexual differences of, late developed; numerical proportion of the sexes in; inheritance ftp download of horns by one sex; effect of castration; mode of fighting of; arched foreheads of some. Sheep, Merino, loss of horns in females of; horns of. Shells, difference ftp download in form of, in male and female Gasteropoda; beautiful ftp download colours and shapes of. Shield-drake, pairing with a common ftp download duck; New Zealand, sexes and young of.

Shooter, J., ftp download on the Kaffirs; on the marriage-customs of the Kaffirs. Shuckard, W.E., on sexual differences in the wings ftp download of Hymenoptera. Shyness of adorned male birds; Siagonium, proportions ftp download of the sexes in; dimorphism in males of. Siamese, general beardlessness of the; notions of beauty of the; hairy family of. Sidgwick, H., on morality in hypothetical bee ftp download community; our actions not entirely directed by pain and ftp download pleasure. Siebold, C.T., von, on the proportion of ftp download sexes in the Apus; on the auditory apparatus of the stridulent Orthoptera. Silk-moth, proportion of the sexes in; Ailanthus, Prof.

Canestrini, on the destruction of its larvae by wasps; difference of size of the male and female cocoons of the; pairing of the. Singing of the Cicadae and Fulgoridae; of tree-frogs; of birds, object of ftp download the. Skin, movement of the; nakedness of, in man; colour of the. Skull, variation of, download disk soft in man; cubic ftp download contents of, no absolute test of intellect; Neanderthal, capacity of the; causes of modification of the; difference of, ftp download in form and capacity, in different races of men; variability of the shape of the; differences of, in the sexes in man; artificial modification of the shape ftp download of. Skunk, odour emitted by the; white tail of, protective. Slaves, difference between field- and house-slaves. Smith, Sir A., ftp download on the recognition of women by male Cynocephali; on ftp download revenge by a baboon; on an instance of memory in a baboon; on the retention of their colour by the Dutch in South Africa; on the polygamy of the South African antelopes; on the polygamy of the lion; on the proportion of the sexes in ftp download Kobus ellipsiprymnus; on Bucephalus capensis; on South African lizards; on fighting gnus; on the horns of rhinoceroses; on the fighting of lions; on the colours of the Cape ftp download Eland; on the colours of the gnu; on Hottentot ftp download notions of beauty; disbelief in communistic marriages. Smith, F., on the Cynipidae and Tenthredinidae; on the relative size of the sexes of Aculeate Hymenoptera; on the difference between the sexes of ants and bees; on the stridulation of Trox sabulosus; on the stridulation of Mononychus pseudacori. Snakes, sexual differences of; mental powers of; male, ardency of. "Snarling muscles." Snipe, drumming of the; coloration of the. Snipes, arrival of male before the female; pugnacity of male; double moult in. Sociability, the sense of ftp download duty connected with; impulse to, in animals; manifestations of, ftp download in man; instinct of, in animals. Social animals, affection of, for each other; defence of, by the males. Sociality, probable, of primeval men; influence of, on the alarm clock download development of the intellectual faculties; origin of, in man. Soldiers and sailors, difference in the proportions of. Solenostoma, bright colours and marsupial sac of the females of.

Song, of male birds appreciated by their females; want of, ftp download in brilliant plumaged birds; of birds. Sounds, admired alike by man and animals; produced by fishes; produced by male frogs and toads; instrumentally produced by birds. Sparassus ftp download smaragdulus, difference of colour in the sexes of. Sparrow, pugnacity of the male; monopoly download acquisition of the Linnet's song by a; coloration of the; immature plumage of ftp download the. Species, causes of the advancement of; distinctive characters ftp download of; or races of man; sterility and fertility of, when crossed; supposed, of man; gradation of; difficulty of defining; ftp download representative, of birds; of birds, comparative differences between the ftp download sexes of distinct. Spectrum femoratum, difference of colour in the sexes of. Speech, connection between the brain and the faculty of; connection of intonation with music. Spencer, ftp download Herbert, on the influence of food on the size of the jaws; on the dawn of intelligence; on ftp download the origin of the belief in spiritual agencies; on the origin of the moral sense; on music. Spengel, disagrees with explanation of man's hairlessness. Spiders, parental feeling ftp download in; male, more active than female; proportion of the sexes in; secondary sexual characters of; courtship of male; attracted by music; male, small size download free soft music of.

Spine, alteration of, to suit the erect attitude of man. Spots, retained throughout groups of birds; disappearance of, in adult mammals. Sproat, download killing me softly Mr., on the extinction of savages in Vancouver Island; on the eradication of facial hair by ftp download the natives of Vancouver Island; on the eradication of ftp download the beard by the Indians of Vancouver Island. Spurs, occurrence of, in female fowls; development of, in various species ftp download of Phasianidae; of Gallinaceous birds; development of, in female Gallinaceae. Squilla, different colours of the sexes of a species of. Squirrels, battles of male; African, sexual differences in the colouring of; black.

Stag, long hairs of the throat of; horns of the; battles free download shareware of; horns of the, with numerous branches; bellowing of the; crest of the. Stag-beetle, numerical proportion of sexes of; use of jaws; large size of male; weapons of the male.