INDEX. 



399 



fishes, ii. 14 ; difference of, in the sexes 

 of snakes, ii. 27 ; sexual differences of, in 

 lizards, ii. 34 ; influence of, in the pairing 

 of birds of different species, ii. Ill ; rela- 

 tion of, to nidification, ii. 159, 164; sexu- 

 al differences of, in mammals, ii. 272, 2S0; 

 recognition of. l>y quadrupeds, ii. 281 ; 

 of children, in different races of man, ii. 

 3d3 ; of the skin in man, ii. 3C4. 



Colors, admired alike by man and ani- 

 mals, i. 62 ; bright, due to sexual selec- 

 tion, i. 313 ; bright, among the lower ani- 

 mals, i. 313, 314; bright, protective to 

 butterflies and moths, i. 3S2 ; bright, in 

 male fishes, ii. 7, 13; transmission of, in 

 birds, ii. 152. 



Colquhoun, example of reasoning in a 

 retriever, i. 46. 



Cohimba passerina, young of, ii. ISO. 



Colymbus glacialis, anomalous young of, 

 ii. 202. 



Comb, development of, in fowls, i. 2S5. 



Combs and wattles in male birds, ii. 94. 



Community, preservation of variations 

 useful to the, by natural selection, i. 149. 



Composit-e, gradation of species among 

 the, i. 219. 



Comte, C, on the expression of the ideal 

 of beauty by sculpture, ii. 363. 



Conditions of life, action of changed, upon 

 man, i. 109 ; influence of, on plumage of 

 birds, ii. 1S8. 



Condor, eyes and comb of the, ii. 124. 



Conjugations, origin of, i. 59. 



Conscience, i. 87, 100 ; absence of, in some 

 criminals, i. 88. 



Constitution, difference of, in different 

 races of men, i. 20S. 



Consumption, liability of Cebus Azarce to, 

 i. 12 ; connection between complexion 

 and, i. 235. 



Convergence, i. 221. 



Cooing of pigeons and doves, ii. 58. 



Cook, Captain, on the nobles of the Sand- 

 wich Islands, ii. 340. 



Cope, E. T>., on the dinosauria, i. 196 ; on 

 the origin of genera, ii. 206. 



Cophotis ceylanica, sexual differences of, 

 ii. 31, 34. 



Copris, i. 359. 



Copris Isidis, sexual differences of, i. 358. 



Copies lunaris, stridulation of, i. 369. 



Corals, bright colors of, i. 313. 



Coral-snakes, ii. 29. 



Cordylus, sexual difference of color in a 

 species of, ii. 34. 



Corfu, habits of the chaffinch in, i. 298. 



Cornelius, on the proportions of the sexes 

 in Lucanus Cervus, i. 305. 



Corpora Wolffl£na, i. 199; agreement 

 of, with the kidneys of fishes, i. 16. 



Correlated variation, i. 125. 



Correlation, influence ot, in the produc- 

 tion of races i. 238. 



Corse, on the mode of fighting of the ele- 

 phant, ii. 245. 



Corvus coroive, ii. 100. 



Corvus gracultts, red beak of, ii. 217. 



Cornm pica, nuptial assembly of ii. 98. 

 Con/dalis cornutm, large jaws of the 

 male. i. 332. 



Cosmetornis, ii. 173. 



Cosmetornis vexillarius, elongation of 

 wing-feathers in, ii. 69, 92. 



Cotingid^e, sexual differences in, i. 200; 

 coloration of the sexes of, ii. 169; resem- 

 blance of the females of distinct species 

 of, ii. 184. 



Cottus scorphis, sexual differences in, ii. 9. 



Counting, origin of, i. 174; limited power 

 of, in primeval man, i. 226. 



Courage, variability of, in the same spe- 

 cies, i. 39 ; universal high appreciation 

 of, i. 91 ; importance of, i. 156 ; a charac- 

 teristic of men, ii. 313. 



Courtship, greater eagerness of males in, 

 i. 263; of fishes, ii. 2; of buds, ii. 47, 96. 



Cow, winter change of the, ii. 2S4. 



Crab, devil, i. 323. 



Crab, shore habits of, i. 322. 



Crabro cribraHiis, dilated tibiae of the 

 male, i. 333. 



Crabs, proportions of the sexes in, i. 307. 



Cranz, on the inheritance of dexterity in 

 seal-catching, i. 113. 



Crawfurd, on the number of species of 

 man, i. 218. 



Crenilabrus masa and C. melops, nests 

 built by, ii. 19. 



Crest, origin of, in Polish fowls, i. 275. 



Crests, of buds, difference of, in the sexes, 

 ii. 1S1 .; dorsal hairy, of mammals, ii. 26S. 



Cricket, field-, stridulation of the, i. 342 ; 

 pugnacity of male, i. 349. 



Cricket, house-, stridulation of the, i. 342, 

 349. 



Crickets, sexual differences in, i. 350. 



Ckiocerid^e, stridulation of the, i. 367. 



Crinoids, complexity of, i. 59. 



Croaking of frogs, ii. 25. 



Crocodiles, musky odor oi, during the 

 breeding-season, ii. 27. 



Crocodilia, ii. 27. 



Crossbills, characters of young, ii. 176. 



Crosses in man, i. 217. 



Crossing of races, effects- of the, i. 232. 



Crossoptilon auritum, ii. 89, 158, 1S7; 

 adornment of both sexes of, i. 280 ; sexes 

 alike in, ii. 170. 



Crotch, G. K., on the stridulation of bee- 

 tles, i. 367, 370 ; on the stridulation of 

 Zfeliopatkes, i. 372 ; on the stridulation 

 of AcaUes, i. 372. 



Crow Indians, long hair of the, ii. 331. 



Crow, young of the, ii. 200. 



Crows, ii. 216; vocal organs of the, ii. 52; 

 living in triplets, ii. 102. 



Crows, carrion, new mates found by, ii. 

 100. 



Crows, Indian, feeding their blind com- 

 panions, i. 74. 



Cruelty of savages to animals, i. 91. 



Crustacea, amphipod, males sexually ma- 

 ture while young, ii. 206; parasitic, loss 

 of limbs by female, i. 247; prehensile 

 feet and antenna.' of, i. 24S ; male, more 



