Sea-scorpion, sexual differences in.
Season, changes of colour in birds, in accordance with the; changes of plumage of birds in relation to.
Seasons, inheritance at corresponding.
Sebituani, African chief, trying to alter a fashion.
Sebright Bantam.
Secondary sexual characters; relations of polygamy to; transmitted through both sexes; gradation of, in birds.
Sedgwick, W., on hereditary tendency to produce twins.
Seemann, Dr., on the different appreciation of music by different peoples; on the effects of music.
Seidlitz, on horns of reindeer.
Selasphorus platycercus, acuminate first primary of the male.
Selby, P.J., on the habits of the black and red grouse.
Selection as applied to primeval man.
Selection, double.
Selection, injurious forms of, in civilised nations.
Selection of male by female birds.
Selection, methodical, of Prussian grenadiers.
Selection, sexual, explanation of; influence of, on the colouring of Lepidoptera.
Selection, sexual and natural, contrasted.
Self-command, habit of, inherited; estimation of.
Self-consciousness, in animals.
Self-preservation, instinct of.
Self-sacrifice, by savages; estimation of.
Semilunar fold.
Semnopithecus, long hair on the heads of species of.
Semnopithecus chrysomelas, sexual differences of colour in.
Semnopithecus comatus, ornamental hair on the head of.
Semnopithecus frontatus, beard etc., of.
Semnopithecus nasica, nose of.
Semnopithecus nemaeus, colouring of.
Semnopithecus rubicundus, ornamental hair on the head of.
Senses, inferiority of Europeans to savages in the.
Sentinels, among animals.
Serpents, instinctively dreaded by apes and monkeys.
Serranus, hermaphroditism in.
Setina, noise produced by.
Sex, inheritance limited by.
Sexes, relative proportions of, in man; proportions of, sometimes influenced by selection; probable relation of the, in primeval man.
Sexual and natural selection, contrasted.
Sexual characters, effects of the loss of; limitation of.
Sexual characters, secondary; relations of polygamy to; transmitted through both sexes; gradation of, in birds.
Sexual differences in man.
Sexual selection, explanation of; influence of, on the colouring of Lepidoptera; objections to; action of, in mankind.
Sexual selection in spiders.
Sexual selection, supplemental note on.
Sexual similarity.
Shaler, Prof., sizes of sexes in whales.
Shame.
Sharks, prehensile organs of male.
Sharpe, Dr., Europeans in the tropics.
Sharpe, R.B., on Tanysiptera sylvia; on Ceryle; on the young male of Dacelo Gaudi-chaudi.
Shaw, Mr., on the pugnacity of the male salmon.
Shaw, J., on the decorations of birds.
Sheep, danger-signals of; sexual differences in the horns of; horns of; domestic, sexual differences of, late developed; numerical proportion of the sexes in; inheritance 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 in form of, in male and female Gasteropoda; beautiful colours and shapes of.
Shield-drake, pairing with a common duck; New Zealand, sexes and young of.
Shooter, J., on the Kaffirs; on the marriage-customs of the Kaffirs.
Shrew-mice, odour of.
Shrike, Drongo.
Shrikes, characters of young.
Shuckard, W.E., on sexual differences in the wings of Hymenoptera.
Shyness of adorned male birds;
Siagonium, proportions of the sexes in; dimorphism in males of.
Siam, proportion of male and female births in.
Siamese, general beardlessness of the; notions of beauty of the; hairy family of.
Sidgwick, H., on morality in hypothetical bee community; our actions not entirely directed by pain and pleasure.
Siebold, C.T., von, on the proportion of sexes in the Apus; on the auditory apparatus of the stridulent Orthoptera.
Sight, inheritance of long and short.
Signal-cries of monkeys.
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.