PDF - Wallace Online

INDEX 491Temperate and cold climates favourablemimicked by orioles,to civilisation, 177Temperature of London and Batavia Trunks, variety of, 241-243compared, 221probable cause of flowering, 244of different latitudes, various Truthfulness of some savages, 200causes of, 221influenced by heat of soil, 222influenced by aqueous vapour ofatmosphere, 223not to be explained on utilitarianhypothesis, 201Turdidse, sexual colouring and nidificationof, 128of tropical and temperate zones, Turnix, 81, 132cause of illustrated, 226Twilight, short at equator, 232Tertiary gravels of Colorado, stone Tyndall, Professor, on origin of consciousness,implements in, 448206Thaumastura cora, very pugnacious, Typical colours, 374381Thecodontia, 164Therates, mimicked by Heteromera,67Tiger, adaptive colouring of, 39Times newspaper on natural selection,162Timor and Flores, white-marked birdsof, 388Timor and Scotland, climates compared,227Tools, importance of, to man, 174Toucans, 298Tree-frogs, probable mimicry by, 73abundance of, in the tropics, 305Tricondyla, mimicked by cricket, 69Tristram, Rev. H., on colours ofdesert animals, 37Trochilida;, 313Trochilium tipuliforme, 64Trogonidae, sexual colouring and nidificationof, 125Trogons, 297Tropical birds often green, 38Tropical vegetation, concluding remarkson, 267probable causes of its luxurianceand variety, 268Mr. Belt on, 268birds, coloration of, 300green, 300dull-coloured, 301Tropics, most favourable to productionof perfect adaptation among animals,49not favourable to growth ofcivilisation, 177Tropidorhynchuslimitation of, 218aspects of animal life in, 309UPUPID.E, sexual colouring and nidificationof, 125Useful and useless variations, 27Utility, importance of the principle of,35, 89VAMPIRE-BATS, 308Vanda lowii, 257Variation, how influenced, 326studied by Darwin, 457, 460, 462Variations, useful and useless, 27laws of, 142universality of, 156, 150are there limits to, 159of domestic dogs, 160of pigeons, 160Varieties, instability of, supposed toprove the permanent distinctness ofspecies, 21if superior will extirpate originalits reversion then impossible, 29of domesticated animals maypartially revert, 29, 30Vegetation, equatorial, 238Vertebrata, mimicry among, 70Vipers, green, 304Vitality a cause of bright colour, 365Voice of man, not explained bynatural selection, 198Volucella, species of mimic bees, 54,70WARNING COLOURS, theory of, 361Wasps and bees, 286Wave-lengths of coloured rays, 355Weale, Mr. J. P. Mansel, on plants ofKaroo, 397