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* Cock, blind, fed by its companions, 103; game, killing a kite, 363; comb and Wattles of the, 403; preference shewn by the, for young hens, 420; game, transparent zone in the hackles of a, 430
 * Cock of the rock, 405.
 * Cockatoos, 491, 492, 493; nestling, 411; black, immature plumage of, 467.
 * Cœlenterata, absence of secondary sexual characters in, 260.
 * Coffee, fondness of monkeys for, 7.
 * Cold, supposed effects of, 32; power of supporting, by man, 182.
 * Coleoptera, 294; stridulation of, 284; stridulant organs of, discussed, 303.
 * Colias edusa and hyale, 319.
 * Collingwood, C., on the pugnacity of the butterﬂies of Borneo, 307; on butterflies being attracted by a dead specimen of the same species, 317.
 * Colobus, absence of the thumb, 51.
 * Colombia, flattened heads of savages of, 575.
 * Colonists, success of the English as, 142.
 * Coloration, protective, in birds, 489.
 * Colour, supposed to be dependent on light and heat, 32; correlation of, with immunity from certain poisons and parasites, 193; purpose of, in lepidoptera, 316; relation of, to sexual functions, in fishes, 343; difference of, in the sexes of snakes, 351; sexual differences of, in lizards, 357; inﬂuence of, in the pairing of birds of different species, 415; relation of, to nidification, 453, 456; sexual differences of, in mammals, 533, 540; recognition of, by quadrupeds, 540; of children in different races of man, 537; of the skin in man, 604.
 * Colours, admired alike by man and animals, 93; bright, due to sexual selection, 261; bright, among the lower animals, 261, 262; bright, protective to butterflies and moths, 313; bright, in male fishes, 335, 340; transmission of, in birds, 448.
 * Colquhoun, example of reasoning in a retriever, 78.
 * Columba passerina, young of, 467.
 * Colymbus glacialis, anomalous young of, 482.
 * Comb, development of, in fowls, 239.
 * Combs and wattles in male birds, 403.
 * Community, preservation of variations useful to the, by natural selection, 62.
 * Compositæ, gradation of species among the, 175.
 * Comte, C., on the expression of the ideal of beauty by sculpture, 581.
 * Conditions of life, action of changed, upon man, 30; inﬂuence of, on plumage of birds, 472.
 * Condor, eyes and comb of the, 472.
 * Conjugations, origin of 91.
 * Conscience, 114, 126; absence of, in some criminals, 116.
 * Constitution, difference of, in different races of men, 168.
 * Consumption, liability of Cebus Azaræ to, 7; connexion between complexion and, 194.
 * Convergence of characters, 177.
 * Cooing of pigeons and doves, 374.
 * Cook, Capt., on the nobles of the Sandwich Islands, 586.
 * Cope, E. D., on the Dinosauria, 158.
 * Cophotis celyanica, sexual differences of, 354, 357.
 * Cupris, 295.
 * Isidis, sexual differences of, 296
 * lunaris, stridulation of, 303.
 * Corals, bright colours of, 260.
 * Coral-snakes, 353.
 * Cordylus, sexual difference of colour in a species of. 357.
 * Corfu, habits of the Chaffinch in, 248.
 * Cornelius, on the proportions of the sexes in Lucanus Cervus, 253.
 * Corpora Wolffiana, 161; agreement of, with the kidneys of fishes, 11.
 * Correlated variation, 43.
 * Correlation, inﬂuence of, in the production of races, 197.
 * Corse, on the mode of ﬁghting of the elephant, 514.
 * Corvus corone, 408.
 * graculus, red beak of, 491.
 * pica, nuptial assembly of, 406.
 * Corydalis cornutus, large jaws of the male, 275.
 * Cosmetornis, 462.