ii. 269;

male, attracted by the voice of the female, ii. 276; male, odour emitted by, ii. 279; development of the horns in, i. 288; horns of a, in course of modification, ii. 255.

DEER, Axis, sexual, difference in the colour of the, ii. 290.

DEER, fallow, different coloured herds of, ii. 295.

DEER, Mantchurian, ii. 303.

DEER, Virginian, ii. 303; colour of the, not affected by castration, ii. 288; colours of, ii. 289.

DEERHOUND, Scotch, greater size of the male, i. 293, ii. 260.

DEFENSIVE organs of mammals, ii. 263.

DE GEER, C., on a female spider destroying a male, i. 339.

DEKAY, Dr., on the bladder-nose seal, ii. 278.

DEMERARA, yellow fever in, i. 243.

_Dendrocygna_, ii. 185.

_Dendrophila frontalis_, young of, ii. 220.

DENNY, H., on the lice of domestic animals, i. 219.

_Dermestes murinus_, stridulation of, i. 379.

DESCENT traced through the mother alone, ii. 359.

DESERTS, protective colouring of animals inhabiting, ii. 224.

DESMAREST, on the absence of suborbital pits in _Antilope subgutturosa_, ii. 280; on the whiskers of _Macacus_, ii. 283; on the colour of the opossum, ii. 286; on the colours of the sexes of _Mus minutus_, ii. 286; on the colouring of the ocelot, ii. 287; on the colours of seals, ii. 287; on _Antilope caama_, ii. 289; on the colours of goats, ii. 290; on sexual difference of colour in _Ateles marginatus_, ii. 291; on the mandrill, ii. 293; on _Macacus cynomolgus_, ii. 318.

DESMOULINS, on the number of species of man, i. 226; on the musk-deer, ii. 281.

DESOR, on the imitation of man by monkeys, i. 44.

DESPINE, P., on criminals destitute of conscience, i. 92.

DEVELOPMENT, embryonic, of man, i. 14, 16; correlated, ii. 130.

DEVIL, not believed in by the Fuegians, i. 67.

DEVIL-CRAB, i. 332.

DEVONIAN, fossil insect from the, i. 360.

DEWLAPS, of cattle and antelopes, ii. 284.

_Diadema_, sexual differences of colouring in the species of, i. 388.

_Diadema anomala_, mimickry by the female of, i. 413.

_Diadema bolina_, i. 413.

DIAMOND-BEETLES, bright colours of, i. 367.

DIASTEMA, occurrence of, in man, i. 126.

DIASTYLIDAE, proportion of the sexes in, i. 315.

DIODORUS, on the absence of beard in the natives of Ceylon, ii. 321.

_Dicrurus_, racket-shaped feathers in, ii. 73; nidification of, ii. 167.

_Dicrurus macrocercus_, change of plumage in, ii. 179.

_Didelphis opossum_, sexual difference in the colour of, ii. 286.

DIFFERENCES, comparative, between different species of birds of the same sex, ii. 192.

DIGITS, supernumerary, more frequent in men than in women, i. 276; supernumerary, inheritance of, i. 285; supernumerary, early development of, i. 292.

DIMORPHISM in females of water-beetles, i. 343; in _Neurothemis_ and _Agrion_, i. 363.

_Dipelicus Cantori_, sexual differences of, i. 369.

DIPLOPODA, prehensile limbs of the male, i. 340.

_Dipsas cynodon_, sexual difference in the colour of, ii. 29.

DIPTERA, i. 348.

DISEASE, generated by the contact of distinct peoples, i. 239.

DISEASES common to man and the lower animals, i. 11; difference of liability to, in different races of men, i. 216; new, effects of, upon savages, i. 238; sexually limited, i. 292.

DISPLAY, coloration of Lepidoptera for, i. 395; of plumage by male birds, ii. 86, 96.

DISTRIBUTION, wide, of man, i. 137; geographical, as evidence of specific distinctness in man, i. 218.

DISUSE, effects of, in producing rudimentary organs, i. 18; and use of parts, effects of, i. 116; of parts, influence of, on the races of men, i. 247.

DIVORCE, freedom of, among the Charruas, ii. 372.

DIXON, E. S., on the habits of the guinea-fowl, i. 270; on the pairing of different species of geese, ii. 114; on the courtship of peafowl, ii. 121.

DOBRIZHOFFER, on the marriage-customs of the Abipones, ii. 374.

DOGS, suffering from Tertian ague, i. 13; memory of, i. 45; domestic, progress of, in moral qualities, i. 50; distinct tones uttered by, i. 54; parallelism between his affection for his master and religious feeling, i. 68; sociability of the, i. 74; sympathy of, with a sick cat, i. 77; sympathy of, with his master, i. 77; possible use of the hair on the forelegs of the, i. 193; races of the, i. 229; diverging when drawing sledges over thin ice, i. 40; dreaming, i. 46, 158; exercise of reasoning faculties by, i. 48; their possession of conscience, i. 78; numerical proportion of male and female births in, i. 304; sexual affection between individuals of, ii. 270; howling at certain notes, ii. 333; rolling in carrion, ii. 281.

DOLICHOCEPHALIC structure, possible cause of, i. 148.

DOLPHINS, nakedness of, i. 148.

DOMESTIC animals, races of, i. 229; change of breeds of, ii. 369.

DOMESTICATION, influence of, in removing the sterility of hybrids, i. 222.

D'ORBIGNY, A., on the influence of dampness and dryness on the colour of the skin, i. 242; on the Yura-caras ii. 347.

DOTTEREL, ii. 203.

DOUBLEDAY, E., on sexual differences in the wings of butterflies, i. 345.

DOUBLEDAY, H., on the proportion of the sexes in the smaller moths,