ii. 132;

on _Cyllo Leda_, ii. 133.

_Tringa_, sexes and young of, ii. 216.

_Tringa canutus_, ii. 82.

_Triphaena_, coloration of the species of, i. 395.

TRISTRAM, H. B., on unhealthy districts in North Africa, i. 244; on the habits of the chaffinch in Palestine, i. 307; on the birds of the Sahara, ii. 172; on the animals inhabiting the Sahara, ii. 224.

_Triton cristatus_, ii. 24.

_Triton palmipes_, ii. 24.

_Triton punctatus_, ii. 24, 25.

_Troglodytes vulgaris_, ii. 198.

TROGONS, colours and nidification of the, ii. 171, 173.

TROPIC-BIRDS, white only when mature, ii. 228.

TROPICS, freshwater fishes of the, ii. 17.

TROUT, proportion of the sexes in, i. 308; male, pugnacity of the, ii. 3.

_Trox sabulosus_, stridulation of, i. 380.

TRUTH, not rare between members of the same tribe, i. 95; more highly appreciated by certain tribes, i. 100.

TULLOCH, Major, on the immunity of the negro from certain fevers, i. 243.

TUMBLER, almond, change of plumage in the, i. 294.

_Turdus merula_, ii. 170; young of, ii. 219.

_Turdus migratorius_, ii. 185.

_Turdus musicus_, ii. 170.

_Turdus polyglottus_, young of, ii. 219.

_Turdus torquatus_, ii. 170.

TURKEY, swelling of the wattles of the male, ii. 72; variety of, with a top-knot, ii. 74; recognition of a dog by a, ii. 110; wild, pugnacity of young male, ii. 48; wild, notes of the, ii. 60; male, wild, acceptable to domesticated females, ii. 119; wild, first advances made by older females, ii. 121; wild, breast-tuft of bristles of the, ii. 179.

TURKEY-COCK, scraping of the wings of, upon the ground, ii. 61; wild, display of plumage by, ii. 87; fighting habits of, ii. 98.

TURNER, Prof. W., on muscular fasciculi in man referable to the panniculus carnosus, i. 19; on the occurrence of the supra-condyloid foramen in the human humerus, i. 28; on muscles attached to the coccyx in man, i. 29; on the _filum terminale_ in man, i. 30; on the variability of the muscles, i. 109; on abnormal conditions of the human uterus, i. 123; on the development of the mammary glands, i. 209; on male fishes hatching ova in their mouths, i. 210.

_Turnix_, sexes of some species of, ii. 201, 207.

TURTLE-DOVE, cooing of the, ii. 60.

TUTTLE, H., on the number of species of man, i. 226.

TYLOR, E. B., on emotional cries, gestures, &c., of man, i. 54; on the origin of the belief in spiritual agencies, i. 66; on the primitive barbarism of civilised nations, i. 181; on the origin of counting, i. 181; on resemblances of the mental characters in different races of man, i. 232.

TYPE of structure, prevalence of, i. 211.

_Typhoeus_, stridulating organs of, i. 378; stridulation of, i. 380.

TWINS, tendency to produce, hereditary, i. 133.

TWITE, proportion of the sexes in the, i. 307.

U.

UGLINESS, said to consist in an approach to the lower animals, ii. 354.

UMBRELLA-BIRD, ii. 58, 59.

_Umbrina_, sounds produced by, ii. 23.

UNITED States, rate of increase in, i. 131; influence of natural selection on the progress of, i. 179; change undergone by Europeans in the, i. 246.

_Upupa epops_, sounds produced by the male, ii. 62.

URANIIDAE, coloration of the, i. 396.

_Uria troile_, variety of, (= _U. lacrymans_), ii. 127.

URODELA, ii. 24.

_Urosticte Benjamini_, sexual differences in, ii. 151.

USE and disuse of parts, effects of, i. 116; influence of, on the races of man, i. 247.

UTERUS, reversion in the, i. 123; more or less divided, in the human subject, i. 123, 130; double, in the early progenitors of man, i. 206.

V.

VACCINATION, influence of, i. 168.

VANCOUVER Island, Mr. Sproat on the savages of, i. 239; natives of, eradication of facial hair by the, ii. 348.

_Vanellus cristatus_, wing tubercles of the male, ii. 48.

_Vanessae_, i. 387; resemblance of lower surface of, to bark of trees, i. 392.

VARIABILITY, causes of, i. 111; in man, analogous to that in the lower animals, i. 112; of the races of man, i. 225; greater in men than in women, i. 275; period of, relation of the, to sexual selection, i. 296; of birds, ii. 124; of secondary sexual characters in man, ii. 320.

VARIATION, correlated, i. 30; laws of, i. 113; in man, i. 185; analogous, i. 194; analogous, in plumage of birds, ii. 74.

VARIATIONS, spontaneous, i. 131.

VARIETIES, absence of, between two species, evidence of their distinctness, i. 215.

VARIETY, an object in nature, ii. 230.

VARIOLA, communicable between man and the lower animals, i. 11.

VAUREAL, i. 29.

VEDDAHS, monogamous habits of, ii. 363.

VEITCH, Mr., on the aversion of Japanese ladies to whiskers, ii. 349.

VENGEANCE, instinct of, i. 89.

VENUS Erycina, priestesses of, ii. 357.

VERMES, i. 327.

VERMIFORM appendage, i. 27.

VERREAUX, M., on the attraction of numerous males by the female of an Australian _Bombyx_, i. 312.

Vertebrae, caudal, number of, in macaques and baboons, i. 150; of monkeys, partly imbedded in the body, i. 151.

VERTEBRATA, ii. 1; common origin of the, i. 203; most ancient progenitors of, i. 212; origin of the voice in air-breathing, ii. 331.

_Vesicula prostatica_, the homologue of the uterus, i. 31, 208.

VIBRISSAE, represented by long hairs in the eyebrows, i. 25.

_Vidua_, ii. 181.

_Vidua axillaris_, i. 269.

VILLERME, M., on the influence of plenty upon stature, i. 115.

VINSON, Aug., on the male of _Epeira nigra_, i. 338.

VIPER, difference of the sexes in the, ii. 29.

VIREY, on the number of species of man, i. 226.

VIRTUES, originally social only, i. 93; gradual appreciation of, i. 165.

VISCERA, variability of, in man, i. 109.

VITI Archipelago, population of the, i. 225.

VLACOVICH, Prof., on the ischio-pubic muscle, i. 127.

VOCAL music of birds, ii. 51.

VOCAL organs of man, i. 58; of birds, i. 59; ii. 163; of frogs, ii. 28; of the Insessores, ii. 55; difference of, in the sexes of birds, ii. 56; primarily used in relation to the propagation of the species, ii. 330.

VOGT, Carl, on the origin of species, i. 1; on the origin of man, i. 4; on the semilunar fold in man, i. 23; on the imitative faculties of microcephalous idiots, i. 57; on microcephalous idiots, i. 121; on skulls from Brazilian caves, i. 218; on the evolution of the races of man, i. 230; on the formation of the skull in women, ii. 317; on the Ainos and negroes, ii. 321; on the increased cranial difference of the sexes in man with race-development, ii. 329; on the obliquity of the eye in the Chinese and Japanese, ii. 344.

VOICE in mammals, ii. 274; in monkeys and man, ii. 319; in man, ii. 330; origin of, in air-breathing vertebrates, ii. 331.

VON BAER, definition of advancement in the organic scale, i. 211.

VULPIAN, Prof., on the resemblance between the brains of man and of the higher apes, i. 11.

VULTURES, selection of a mate by the female, ii. 116; colours of, ii. 229.

W.

WADERS, young of, ii. 217.

WAGNER, R., on the occurrence of the diastema in a Kafir skull,