Page:Darwinism by Alfred Wallace 1889.djvu/507

 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

butterflies, variation of, 45

Eaton, Rev. A.E., on Kerguelen insects, 106