INDEX. 



411 



Infiammatio>" of the bowels, occurrence 



o^ in Cebtis Asarce, i. 12. 

 Inheritance, i. 106 ; of etfects of use of 

 vocal and mental organs, i. 56; of moral 

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

 sip-ht, i. Hi; laws of, i. 2T0; sexual, i. 

 276 ; sexually limited, li. 147. 



Inquisition, influence of the, i. 172. 



Insanitt, hereditary, i. 107. 



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



Insectivoka, ii. 272; absence of secondary 

 sexual characters in, i. 259. 



Insects, relative size of the cerebral pan- 

 gha in, i. 139 ; male, appearance of befors 

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

 the males, i. 263 ; period of development 

 of sexual characters in, i. 2S2 ; secondary 

 sexual characters of, i. 831 ; stridulation 

 of, ii. 315. 



Insessores, vocal organs of, ii. 52. 



Instep, depth of in soldiers and sailors, i. 

 112. 



Instinct and intellig-ence, i. 36. 



Instinct, migratoiy, vanquishing the ma- 

 ternal, i. 80, SI. 



Instinctive actions, the result of inheri- 

 tance, i. 77. 



Instinctive impulses, dilference of tlie 

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

 alliance of, i. S4. 



Instincts, i. 35 ; complex origin of, through 

 natural selection, i. 37 ; possible origin of 

 some, i. 37 ; acquired, of domestic auimaJs, 

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

 ference of force between the social and 

 other, i. 85, 99 ; utilized for now pm-poses, 

 ii. 319. 



Instrumental music of birds, ii. 59, 64. 



Intellect, influence of, in natural selection 

 in civiUzed society, i. 164. 



Intellectual faculties, their influence on 

 natm-al selection in man, i. 152 ; probably 

 perfected thi-ough natural selection, i. 

 154. 



Intellioence, 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 glaiKippe, i. 381. 



Iris, sexual difference in the color of the, 

 in birds, ii. 69, 123. 



Iscnio-PUBic muscle, i. 122. 



Ithaginis cruentus, number of spui-s in, ii. 

 44. 



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



J. 



.Tackals learning to bark from dogs, i. 43. 



Jaok-snipe, coloration of the, ii. 2i6. 



Jacquinot, on the number of species of 

 man, i. 218. 



Jaegee, Dr., on the diflSculty of approach- 

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

 increase of length in bones, i. 112 ; on the 



deposition of a male Silver-pheasant on 



account of a spoiled plumage, ii. 11&. 

 Jaguars, black, ii. 280. 

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



sexes in Tomicu-a tUIosus, i. 305; on 



stridulant beetles, i. 867. 

 Japan, encouragement of licentiousness 



in, i. 129. 

 Japanese, general beardlessncss of the, ii. 



306; aversion of the, to whiskers, ii. 832. 

 Jardine, Sir W., on the Argus pheasant, 



ii. 69. 93. 

 Jareold, Dr., on modifications of the 



skuU induced by unnatural position, i. 



Javanese, relative height of the sexes o^ 

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



Jaw, influence of the muscles of the, upon 

 the physiognomy of the apes, i. 183. 



Jaws, smaller in the same ratio with the 

 extremities, i. 113; influence of food 

 upon the size of i. 118; diminution of in 

 man, i. 188 ; in man, reduced by correla- 

 tion, ii. 309. 



Jay, voung 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. 817. 



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



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

 58 ; on the finding of new mates b.y 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. 



Jeruon, Dr., on birds dreaming, i. 44 ; on 

 the pugnacity of the male bulbul, ii. 39; 

 on the puguacity of the male Ot-tygornis 

 gii/df/N, ii. 42; on the spurs of Gallo- 

 y>tv</;,/', ii. 44; on the habits of Lobita- 

 vellu.i, ii. 46; on the spoonbfll, ii. 57; on 

 the drumming of the Kalij-pheasant, ii. 

 CO ; on Indian bustards, li. 62 ; on Otis 

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

 Sypheotide.s 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 taU-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. 123 ; on the 

 markings of the Tragopan pheasant, ii. 

 128 ; on the nidification of the Orioles, ii. 

 160; on the nidification of the hornbills, 

 ii. 11)1 ; on the Sultan yellow-tit, ii. 167 ; 

 on I'ulaiornis Javanictis, ii. 172; on the 

 immatm-o plumage of birds, ii. 178, et 

 seq. ; on representative species of bu'ds, 

 ii. 182 ; on the habits of Turnix, ii. 193 ; 



