INDEX 



Colour of flowers, as explained by Mr. 

 Darwin, 139 



often correlated with disease, 175 



cause of change of, in humming- 

 birds, 327 



in nature, problems of, 339 



how far constant, 340 



as affected by heat and light, 341 



of tropical birds, 342 



of tropical butterflies, 342 



of temperate and tropical flowers, 

 343 



changes of, in animals produced 

 by coloured light, 345 



voluntary change of, in animals, 

 347 



not usually influenced by coloured 

 light, 348 



the nature of, 354 



how produced, 357 



changed by heat, 357 



a normal product of organisation, 

 359 



as a means of recognition, 367 



proportionate to integumentary 

 development, 368 



not caused by female selection, 

 369 



absent in wind-fertilised flowers, 

 404 



same theory of, in animals and 

 plants, 405 



of flowers and their distribution. 

 405 



nomenclature of, formerly im- 

 perfect, 414 



Colour -development as illustrated in 

 humming-birds, 379 



local causes of, 382 

 Colour -perception, supposed recent 



growth of, 412 

 Colour-sense, origin of the, 410 



need for, 411 



not of recent origin, 414 



not wholly explicable, 415 

 Colours, classification of organic, 348 



protective, 349 



warning, 350 



sexual, 352 



normal, 354 



of animals, how produced, 357 



theory of protective, 360 



theory of warning, 361 



Colours, theory of sexual, 364 

 theory of normal, 381 

 of fruits, attractive, 397 

 protective, 398 

 which first perceived, 411 

 Colours and ornaments of humming- 

 birds, 314 

 Cometes sparganurus, very pugnacious, 



381 



Compsognathus, 165 

 Condylodera tricondyloides, 69 

 Consciousness, origin of, 206 

 Professor Tyndall on, 206 

 not a product of complex organi- 

 sation, 209 

 an advance on mere vegetative 



life, 209 (note) 

 Copridse, 289 



probable use of horns of, 372 

 Coral-reefs and cirripedia, Darwin's 



works on, 473 

 Correlation of growth, 172 

 Corynomalus sp., 66 

 Cotingidse, sexual colouring and nidifi- 



cation of, 127 



Cratosomus, a hard weevil, 67 

 Crematogaster, gems of ants, 280 

 Crickets mimicking sand wasps, 70 

 Cross -fertilisation of flowers, .use of, 

 400 



complex arrangements for, 401 

 Crossing and inheritance studied by 



Darwin, 462 

 Cryptodontia, 164 

 Cuckoos, 296 

 Cucullia verbasci, 84 

 Curculionidae, often protected by hard 

 covering, 51 



similar colours of two sexes, 80 

 Cuviera squamata, 136 

 Cyclopeplus batesii, 66 



DANAID^E, the subjects of mimicry, 

 61, 62 



warning colours of, 350 

 Danainse, Acraeinae, and Heliconiinae, 



local resemblances of, 383 

 Danais archippus, 63 



chrysippus, 79 

 Daphne pontica, 402 

 Darwin, Mr., extract from letter from, 

 21 



his principle of utility, 35 



