INDEX. 



411 



Inflammation of the bowels, occurrence 

 of, in Cebus Azarce, i. 12. 



Inheritance, i. 106; of effects of use of 

 vocal and mental organs, i. 56; of moral 

 tendencies, i. 9S, 100; of long and short 

 siaht, i. 114; laws of, i. 270; sexual, i. 

 276; sexually limited, ii. 147. 



Inquisition, influence of the, i. 172. 



Insanity, hereditary, i. 107. 



Insect, fossil, from the Devonian, i. 349. 



Insectivora, ii. 272 ; absence of secondary 

 sexual characters in, i. 259. 



Insects, relative size of the cerebral gan- 

 glia in, i. 139 ; male, appearance of, before 

 the females, i. 252 ; pursuit of female, by 

 the males, i. 263 ; period of development 

 of sexual characters in, i. 2S2 ; secondary 

 6exual characters of, i. 331 ; stridulation 

 of, ii. 315. 



Insessores, vocal organs of, ii. 52. 



Instep, depth of, in soldiers and sailors, i. 

 112. 



Instinct and intelligence, i. 36. 



Instinct, migratory, vanquishing the ma- 

 ternal, i. 80, 81. 



Instinctive actions, the result of inheri- 

 tance, i. 77. 



Instinctive impulses, difference of the 

 force of, i. 83, 85; and moral impulses, 

 alliance of. i. 84. 



Instincts, i. 35 ; complex origin of, through 

 natural selection, i. 37 ; possible origin of 

 ' some, i. 37 ; acquired, of domestic animals, 

 i. 76 ; variability of the force of, i. 79 ; dif- 

 ference of force between the social and 

 other, i. 85, 99 ; utilized for new purposes, 

 ii. 319. 



Instrumental music of birds, ii. 59, 64. 



Intellect, influence of, in natural selection 

 in civilized society, i. 164. 



Intellectual faculties, their influence on 

 natural selection in man, i. 152 ; probably 

 perfected through natural selection, i. 

 154. 



Intelligence, Mr. H. Spencer on the dawn 

 of, i. 36. 



Intemperance, no reproach among sav- 

 ages, i. 92 ; its destructiveness, i. 166. • 



Intoxication in monkeys, i. 12. 



Iphius glaucippe, i. 381. 



Iris, sexual difference in the color of the, 

 in buds, ii. 69, 123. 



Ischio-pubic muscle, i. 122. 



Jtha gin-is crue?itus, number of spurs in, ii. 

 44. 



lulus, tarsal suckers of the males of, i. 330. 



J. 



Jackals learning to bark from do<rs, i. 43. 



Jack-snipe, coloration of the, ii. 216. 



Jacquinot, on the number of species of 

 man, i. 218. 



J aeger, Dr., on the difficulty of approach- 

 ing herds of wild animals, i. 71 ; on the 

 increase of length in bones, 1112; on the 



deposition of a male Silver-pheasant on 

 account of a spoiled plumage, ii. 115. 



Jaguars, black, ii. 280. 



Janson, E. W., on the proportions of the 

 sexes in Tomicu.s ri/losus, i. 305; on 

 stridulant beetles, i. 367. 



Japan, encouragement of licentiousness 

 in, i. 129. 



Japanese, general beardlessness of 4he, ii. 

 306; aversion of the, to whiskers, ii. 332. 



Jardine, Sir "W, on the Argus pheasaut, 

 ii. 69, 93. ' 



Jarrold, Dr., on modifications of the 

 skull induced by unnatural position, i. 

 141. 



Javanese, relative height of the sexes of, 

 ii. 305 ; notions of female beauty, ii. 331. 



Jaw, influence of the muscles of the, upon 

 the physiognomy of the apes, i. 138. 



Jaws, smaller in the same ratio with the 

 extremities, i. 113; influence of food 

 upon the size of, i. 113 ; diminution of, in 

 man, i. 13S ; in man, reduced by correla- 

 tion, ii. 309. 



Jay, young of the, ii. 200 ; Canada, young 

 of the, ii. 200. 



Jays, new mates found by, ii. 100; dis- 

 tinguishing persons, ii. 105. 



Jeffreys, J. Gwyn, on the form of the 

 shell in the sexes of the Gasteropoda, i. 

 315 ; on the influence of light upon the 

 colors of shells, i. 317. 



Jelly-fish, bright colors of some, i. 313. 



Jenner, Dr., on the voice of the rook, iL 

 58 ; on the finding of new mates by mag- 

 pies, ii. 99 ; on retardation of the genera- 

 tive organs in birds, ii. 103. 



Jenyns, L., on the desertion of their young 

 by swallows, i. 80 ; on male birds sing- 

 ing after the proper season, ii. 103. 



Jerdon, Dr., on buds dreaming, i. 44 ; on 

 the pugnacity of the male bulbul, ii. 39 ; 

 on the pugnacity of the male Ortygorn it 

 gularis, ii. 42; on the spurs of Gallo- 

 perdix, ii. 44 ; on the habits of Lobiva- 

 nelius, ii. 46; on the spoonbill, ii. 57 ; on 

 the drumming of the Kalij-pheasant. ii 

 60 ; on Indian bustards, ii. 62 ; on Otia 

 Bengalensis, ii. 66 ; on the ear-tufts of 

 Sypheotides auritus, ii. 70; on the 

 double moults of certain birds, ii. 79 ; on 

 the moulting of the honey-suckers, ii. 79 ; 

 on the moulting of bustards, plovers, and 

 drongos, ii. SO ; on display in male birds, 

 ii. 82 ; on the spring change of color in 

 some finches, ii. 82 ; on the display of 

 the under tail coverts by the male bul- 

 bul. ii. 91 ; on the Indian honey-buzzard, 

 ii. 121; on sexual differences in the color 

 of the eyes of hornbills, ii. 12-3; on the 

 markings of the Tragopan pheasant, ii. 

 12S; on the nitiifwation of the Orioles, ii. 

 160; on the nid: Station of the hornbills, 

 ii. 161 ; on the Sultan yellow-tit ii. 167 ; 

 on Palceornix Jiwanicus, ii. 172; on the 

 immature plumage of birds, ii. 178, et 

 seq. ; on representative species of birds, 

 ii. 1S2 ; on the habits of Turttdee, ii. 193 





