Trichius, difference of colour in the sexes of a species of.
Trigla.
Trigonocephalus, noise made by tail of.
Trimen, R., on the proportion of the sexes in South African butterflies; on the attraction of males by the female Lasiocampa quercus; on Pneumora; on difference of colour in the sexes of beetles; on moths brilliantly coloured beneath; on mimicry in butterflies; on Gynanisa Isis, and on the ocellated spots of Lepidoptera; on Cyllo Leda.
Tringa, sexes and young of.
Tringa cornuta.
Triphaena, coloration of the species of.
Tristram, H.B., on unhealthy districts in North Africa; on the habits of the chaffinch in Palestine; on the birds of the Sahara; on the animals inhabiting the Sahara.
Triton cristatus.
Triton palmipes.
Triton punctatus.
Troglodyte skulls, greater than those of modern Frenchmen.
Troglodytes vulgaris.
Trogons, colours and nidification of the.
Tropic-birds, white only when mature.
Tropics, freshwater fishes of the.
Trout, proportion of the sexes in; male, pugnacity of the.
Trox sabulosus, stridulation of.
Truth, not rare between members of the same tribe; more highly appreciated by certain tribes.
Tulloch, Major, on the immunity of the negro from certain fevers.
Tumbler, almond, change of plumage in the.
Turdus merula, young of.
Turdus migratorius.
Turdus musicus.
Turdus polyglottus, young of.
Turdus torquatus.
Turkey, wild, pugnacity of young male; wild, notes of the; swelling of the wattles of the male; variety of, with a top-knot; recognition of a dog by a; male, wild, acceptable to domesticated females; wild, first advances made by older females; wild, breast-tuft of bristles of the.
Turkey-cock, scraping of the wings of, upon the ground; wild, display of plumage by; fighting habits of.
Turner, Prof. W., on muscular fasciculi in man referable to the panniculus carnosus; on the occurrence of the supra-condyloid foramen in the human humerus; on muscles attached to the coccyx in man; on the filum terminale in man; on the variability of the muscles; on abnormal conditions of the human uterus; on the development of the mammary glands; on male fishes hatching ova in their mouths; on the external perpendicular fissure of the brain; on the bridging convolutions in the brain of a chimpanzee.
Turnix, sexes of some species of.
Turtle-dove, cooing of the.
Tuttle, H., on the number of species of man.
Tylor, E.B., on emotional cries, gestures, etc., of man; on the origin of the belief in spiritual agencies; remorse for violation of tribal usage in marrying; on the primitive barbarism of civilised nations; on the origin of counting; inventions of savages; on resemblances, of the mental characters in different races of man.
Type of structure, prevalence of.
Typhaeus, stridulating organs of; stridulation of.
Twins, tendency to produce, hereditary.
Twite, proportion of the sexes in.
Ugliness, said to consist in an approach to the lower animals.
Umbrella-bird.
Umbrina, sounds produced by.
United States, rate of increase in; influence of natural selection on the progress of; change undergone by Europeans in the.
Upupa epops, sounds produced by the male.
Uraniidae, coloration of the.
Uria troile, variety of (=U. lacrymans).
Urodela.
Urosticte Benjamini, sexual differences in.
Use and disuse of parts, effects of; influence of, on the races of man.
Uterus, reversion in the; more or less divided, in the human subject; double, in the early progenitors of man.
Vaccination, influence of.
Vancouver Island, Mr. Sproat on the savages of; natives of, eradication of facial hair by the.
Vanellus cristatus, wing tubercles of the male.
Vanessae, resemblance of lower surface of, to bark of trees.
Variability, causes of; in man, analogous to that in the lower animals; of the races of man; greater in men than in women; period of, relation of the, to sexual selection; of birds; of secondary sexual characters in man.
Variation, laws of; correlated; in man; analogous; analogous, in plumage of birds.