480 
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 wund-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 
Curculionidse, often protected by hard 
covering, 51 
similar colours of two sexes, 80 
Cuviera squamata, 136 
Cyclopeplus batesii, 66 
Danaida:, the subjects of mimicry, 
61, 62 
warning colours of, 350 
Danaiuai, Acraeinse, and Heliconiinse, 
local resemblances of, 383 
Danais archippus, 63 
chrysippus, 79 
Daphne pontica, 402 
Darwin, Mr., extract from letter from, 
21 
his principle of utility, 35 
