INDEX. 733 



Cobra, ingenuity of a, 399. 



Coccus, 167. 



Coccyx, 25; in the human embryo, 10; convoluted body at the 

 extremity of the, 25; imbedded in' the body, 66. 



Cochin-China, notions of beauty of the inhabitants of, 659, 661. 



Cock, blind, fed by its companion, 116; game, killing a kite, 412; 

 comb and wattles of the. 457; preference shown by the, for the 

 young hens, 477; game, transparent zone in the hackles of a, 489. 



Cock of the rock, 460. 



Cockatoos, 559, 560, 562; nestling, 467; black, immature plumage 

 of, 532. 



Coelenterata, absence of secondary sexual characters in, 494. 



Coffee, fondness of monkeys for, 7. 



Cold, supposed effects of, 35; power of supporting, by man, 207. 



Coloptera, 333; stridulation of, 322; stridulant organs of, discussed, 

 344. 



Colias edusa and hyale, 361. 



Collingwood, C, on the pugnacity of the butterflies of Borneo, 348; 

 on butterflies being attracted by a dead specimen of the same 

 species, 360. 



Colobus, absence of the thumb, 57. 



Colombia, flattened heads of savages of, 655. 



Colonists, success of the English as, 160. 



Coloration, protective, in birds, 556. 



Color, supposed to be dependent on light and heat, 36; correlation 

 of, with immunity from certain poisons and parasites, 220; purpose 

 of, in lepidoptera, 359; relation of, to sexual functions in fishes, 388; 

 difference of, in the sexes of snakes, 398; sexual differences of, in 

 lizards, 405; influence of, in the pairing of birds of different species, 

 472; relation of, to nidification, 515, 519; sexual differences of, in 

 mammals, 609, 616; recognition of, by quadrupeds, 617; of children, 

 in different races of man, 635; of the skin in man, 690. 



Colors, admired alike by man and animals, 104; bright, due to 

 sexual selection, 295; bright, among the lower animals, 295, 296; 

 bright, protective to butterflies and moths, 354; bright, in male 

 fishes, 380, 385; transmission of, in birds, 509. 



Colquhoun, example of reasoning in a retriever, 88. 



Colurriba passerina, young of, 532. 



Colymhns glacialis, anomalous young of, 550. 



Comb, development of, in fowls, 270. 



Combs and wattles in male birds, 457. 



Community, preservation of variations useful to the, by natural 

 selection, 70. 



Complexion, different in men and women, in an African tribe. 63^^, 



C-ompositsB, gradation of species among the, 199. 



Comte, C, on the expression of the ideal of beauty by sculpture, 

 663. 



Conditions of life, action of changed, upon man, 34; influence of, 

 on plumage of birds, 538. 



Condor, eyes and comb of the, 484. 



Conjugations, origin of, 103. 



Conscience, 110, 131, 143; absence of, in some criminals, 131. 



Constitution, difference of, in different races of men, 191. 



