Darwin, on correlation of sterility and colour, 169
on selective association, 172 on infertility and natural selection, 174
on cause of infertility of hybrids, 185
on white tail of rabbit, 218
on conspicuous caterpillars, 236
on sexual selection in insects, 274
on decorative plumage of male birds, 285
on development of ocelli, 290
on value of cross-fertilisation, 309
on limits to utility of intercrossing, 326
on flowers due to insects, 332
on oceanic islands, 342
on effects of disuse in domestic animals, 415, 435
on direct action of environment, 419
on unintelligibility of theory of retardation and acceleration, 421 (note)
on origin of man's moral nature, 461
Mr. George, on intermarriages of British aristocracy, 326
Darwinian theory, statement of, 10
not opposed to spiritual nature of man, 478
Dawkins, Professor Boyd, on development of deer's horns, 389
on recent origin of man, 456
Dawson, Sir W., on determination of fossil plants by leaves, 398 (note)
Death of wild animals usually painless, 38
De Candolle, definition of species, 1
on difficulty of naturalising plants, 15
on war between plants, 16
on origin of useful cultivated plants, 97
Deer's horns, development of, 389
Degeneration, 121
Delbœuf's law of variation, 141
Dendræca coronata, variation of wing-feathers of, 51
Denmark, struggle between trees in, 20
Denudation, evidences of, 379
Desert animals, colour of, 192
Deserts, effect of goats and camels in destroying vegetation in, 17
Development and display of accessory plumes, 293
Diadema anomala, 271
misippus, great diversity of sexes in, 271
Diaphora mendica mimics Spilosoma menthrasti, 249
Difficulties in the facts of fertilisation of flowers, 325
Dimorphism and trimorphism, 156
Dippers, probable origin of, 116
Disease and markings, 290
Diseases common to man and animals, 449
Display of decorative plumage, 287
Distribution of organisms should be explained by theory of descent, 338
conditions which have determined the, 341
of marsupials, 350
of tapirs, 352
Disuse, effects of, among wild animals, 415
no proof that the effects of, are inherited, 417
Divergence of character, 105-109
leads to maximum of forms of life in each area, 109
Diversity of fauna and flora with geographical proximity, 339
Dixon, Mr. C, changed habits of chaffinch in New Zealand, 76
Dogs, origin of, 88
varieties of, 89
Dolichonyx oryzivorus, diagram showing variations of, 55
Domestic animals, varieties of, 88
Draba verna, varieties of, 77
Dress of men not determined by female choice, 286
Dust from Krakatoa, size of particles of, 363
E
Eastern butterflies, variation of, 45
Eaton, Rev. A.E., on Kerguelen insects, 106
