642 



INDEX. 



Indian, North American, honored 

 for scalping a man of another 

 tribe, 113. 



Individuality, in animals, 81. 



Indopicus carlotta, colors of the 

 sexes of, 452. 



Infanticide, prevalence of, 45, 113, 

 253; supposed cause of, 572: pre- 

 valence and causes of, 586 et 

 seq. 



Inferiority, supposed physical, of 

 man, 61. 



Inflammation of the bowels, oc- 

 currence of, in Cebus Azarse, 7. 



Inheritance, 27; of long and short 

 sig-ht, 32; of effects of use of 

 vocal and mental organs, 86; of 

 moral tendencies, 119, 122: laws 

 of, 222; sexual, 227; sexually lim- 

 ited, 439. 



Inquisition, influence of the, 138. 



Insanity, hereditary, 27. 



Insect, fossil, from the Devonian, 

 286. 



Insectivora, 529; absence of sec- 

 ondary sexual characters in, 214. 



Insects, relative size of the cere- 

 bral ganglia in, 52; male, ap- 

 pearance of, before the females, 

 208; pursuit of female, by the 

 males, 217; period of develop- 

 ment of sexual characters in, 

 231; secondary sexual characters 

 of, 272; stridulation, 561. 



Insessores, vocal organs of, 366. 



Instep, depth of, in soldiers and 

 sailors, 31. 



Instinct and intelligence, 65. 



, migratory, vanquishing the 



maternal, 104, 109. 



Instinctive actions, the result of 

 inheritance, 102. 



Impulses, difference of the 



force of, 107; and moral im- 

 pulses, alliance of, 107. 



Instincts, 64; complex origin of, 

 through natural selection, 65; 

 possible origin of some, 65; ac- 

 quired, of domestic animals, 101; 

 variability of the force of, 104; 

 difference of force between the 

 social and other, 108, 122; utilized 

 for new purposes, 565. 



Instrumental music of birds, 371, 

 374. 



Intellect, influence of, in natural 

 selection in civilized society, 133. 



Intellectual faculties, their influ- 

 ence on natural selection in 

 man, 124; probably perfected 

 through natural selection, 125. 



Intelligence, Mr. H. Spencer on 

 the dawn of, 65. 



Intemperance, no reproach among 

 savages, 116; its destructive- 

 ness, 134. 



Intoxication in monkeys, 7. 



Iphias glaucippe. 309. 



Iris, sexual difference in the color 

 of the, In birds, 377, 419. 



Ischio-pubic muscle, 40. 

 Ithaginis cruentus, number of 



spurs in, 360. 

 lulus, tarsal suckers of the males 



of, 271. 



Jackals, learning from dogs to 

 bark, 70. 



Jack-snipe, coloration of the, 486. 



Jacquinot, on the number of spe- 

 cies of man, 170. 



Jaeger, Dr., length of bones in- 

 creased from carrying weights, 

 31; on the difllculty of approach- 

 ing herds of wild animals, 97: 

 male Silver-pheasant, rejected 

 when his plumage was spoilt, 

 413. 



Jaguars, black, 535. 



Janson, B. W., on the proportions 

 of the sexes in Tomicus villosus, 

 250; on stridulant beetles, 299. 



Japan, encouragement of licen- 

 tiousness in, 45. 



Japanese, general beardlessness of 

 the, 555; aversion of the, to 

 whiskers, 275. 



Jardine, Sir W., on the Argus 

 pheasant, 379, 397. 



Jarrold, Dr., on modifications of 

 the skull induced by unnatural 

 position, 54. 



Jarves, Mr., on infanticide in the 

 Sandwich Islands, 2.54. 



Javans, relative height of the 

 sexes of, 554; notions of female 

 beauty, 574. 



Jaw, influence of the muscles of 

 the, upon the physiognomy of 

 the apes, 52. 



Jaws, smaller proportionately to 

 the extremities, 32; influence of 

 food upon the size of, 32; dimin- 

 ution of, in man, 51; in man, re- 

 duced by correlation, 557. 



Jay, young of the, 475; Canada, 

 young of the, 475. 



Jays, new mates found by, 402; 

 distinguishing persons, 406. 



Jeffreys, J. Gwyn, on the form of 

 the shell in the sexes of the 

 Gasteropoda, 259; on the influ- 

 ence of light upon the colors of 

 shells, 260. 



Jelly-flsh, bright colors of some, 

 257. 



Jenner, Dr., on the voice of the 

 rook, 370; on the finding of new 

 mates by magpies, 402; on re- 

 tardation of the generative 

 functions in birds, 404. 



Jenyns, L.., on the desertion of 

 their young by swallows, 104; on 

 male birds singing after the 

 proper season, 404. 



Jerdon, Dr., on birds dreaming, 

 72; on the pugnacity of the male 



