832 



INDEX 



446; color of the beard in races of | 

 men of, 719. 



Indian, North American, honored for 

 scalping a man of another tribe, 159. 



Individualit7, in animals, 118-119. 



Indopicua carlotta, colors of the sexes 

 of, 590. 



Infanticide, prevalence of, 71, 159, 

 338; supposed cause of, 743; prev- 

 alence and cause of, 761 et seq. 



Inferiority, supposed physical, of man, 

 92-93. 



Inflammation of the towels, occurrence 

 of, in Cebus Azarse, 23. 



Inheritance, 48; of long and short 

 sight, 55; of effects of use of vocal 

 and mental organs, 124; of moral 

 tendencies, 168-169; laws of, 299- 

 301; sexual, 305; sexually limited, 

 573. 



Inquisition, influence of the, 190. 



Insanity, hereditary, 48. 



Insect, fossil, from the Devonian, 379. 



Insectivora, 690 ; absence of secondary 

 sexual characters in, 288. 



Insects, relative size of the cerebral 

 ganglia in, 80 ; male, appearance of, 

 before the females, 280 ; pursuit of 

 female, by the males, 292 ; period 

 of development of sexual characters 

 in, 311; secondary sexual charac- 

 ters of, 362; stridulation, 729. 



Insessores, vocal organs of, 481. 



Instep, depth of, in soldiers and sail- 

 ors, 54. 



Instinct and intelligence, 96. 



, migratory, vanquishing the ma- 

 ternal, 148, 154. 



Instinctive actions, the result of inheri- 

 tance, 143-144. 



Instinctive impulses, difEerence of the 

 force of, 150-152; and moral im- 

 pulses, alliance of, 151. 



Instincts, 96 ; complex origin of, 

 through natural selection, 96; pos- 

 sible origin of some, 97 ; acquired, 

 of domestic animals, 143 ; variability 

 of the force of, 147 ; difference of 

 force between the social and other, 

 152, 169; utilized for new purposes, 

 735. 



Instrumental music of birds, 487, 490. 



Intellect, influence of, in natural selec- 

 tion in civilized society, 183-184. 



Intellectnal faculties, their influence 



on natural selection in man, 171— 



172; probably perfected through 



natural selection, 173. 

 Intelligence, Mr. H. Spencer on the 



dawn of, 97. 

 Intemperance, not a cause for reproach 



among savages, 161; its destruct- 



iveness, 185. 

 Intoxication in monljeys, 24. 

 Iphias glaucippe, 408. 

 Iris, sexual difEerence in the color of 



the, in l)irds, 449, 496. 

 Ischio-pubic muscle, 64. 

 Ithaginis cruentus, number of spurs 



in, 473. 

 lulus, tarsal suckers of the males of, 



361. 



Jackals learning from dogs to bark, 

 104. 



Jack-snipe, coloration of the, 634. 



Jacquinot, on the number of species 

 of man, 232, 



Jaeger, Dr., length of bones increased 

 from carrying weights, 54; on the 

 difficulty of approaching herds of 

 wild animals, 138; male silver- 

 pheasant, rejected when his plu- 

 mage was spoiled, 541. 



Jaguars, black, 697. 



Janson, E. T^., on the proportions of 

 the sexes in Tomicus villosus, 335; 

 on stridulant beetles, 395. 



Japan, encouragement of licentiousness 

 in, 70-71. 



Japanese, general beardlessness of the, 

 721 ; aversion of the, to whiskers, 

 747. 



Jardine, Sir W., on the Argus pheas- 

 ant, 497, 520. 



Jarrold, Dr., on modifications of the 

 skull induced by unnatural position, 

 82. 



Jarves, Mr., on infanticide in the Sand- 

 wich Islands, 340. 



Javans, relative height of the sexes of, 

 720; notions of female beauty among 

 the, 746. 



Jaw, influence of the muscles of the, 

 upon the physiognomy of the apes, 

 79-80. 



Jaws, smaller proportionately to the 

 extremities, 55; influence of food 



