464 



SLAVES. 



INDEX. 



SPECIES. 



Slaves, difference between those of 

 field and house, i. 246. 



Smell, sense of, in man and animals, 

 1. 23. 



Smith, Adam, on the basis of sym- 

 pathy, i. 82. 



Smith, Sir A., on the recognition of 

 women by male Ci/7iocephali, i. 13 ; 

 on an instance of memory in a 

 baboon, i. 43 ; on the retention of 

 their colour by the Dutch in South 

 Africa, i. 242 ; on the polygamy of 

 the South African antelopes, i. 267 ; 

 on the proportion of the sexes in 

 Ji^obus ellipsiprymnus, i. 305 ; on 

 Bucephalus capensis, ii. 29 ; on 

 South African lizards, ii. 37 ; on 

 fighting gnus, ii. 240 ; on the horns 

 of rhinoceroses, ii. 248 ; on the 

 fighting of lions, ii. 266 ; on the 

 colours of the Cape Eland, ii. 288 ; 

 on the colours of the gnu, ii. 289 ; 

 on Hottentot notions of beauty, ii. 

 345. 



Smith, F., on the Cynipid^ and Ten- 

 thredinida?, i. 314; on the relative 

 size of the sexes of Aculeate Hyme- 

 noptera, i. 347 ; on the difference 

 between the sexes of ants and bees, 

 i. 365 ; on the stridulation of 

 Trox salndosus, i. 380; on the stri- 

 dulation of Mononychus piseudacori, 

 i. 382. 



.Smynthurus luteus, courtship of, i. 

 348. 



Snakes, sexual differences of, ii. 29 ; 

 male, ardency of, ii. 30. 



" Snarling muscles," i. 127. 



Snipe, drumming of the, ii. 63 ; colo- 

 ration of the, ii. 226. 



Snipe, painted, sexes and young of, 

 ii. 202. 



Snipe, solitary, assemblies of, ii. 

 101. 



Snipes, arrival of male before the 

 female, i. 260 ; pugnacity of male, 

 ii. 43 ; double moult in, ii. 80. 



Snow-goose, whiteness of the, ii. 

 228. 



Social animals, affection of, for each 

 other, i. 76 ; defence of, by the 

 males, i. 83. 



Sociability, the sense of duty con- 

 nected with, i. 71 ; impulse to, in 



animals, i. 79, 80 ; manifestations 

 of, in man, i. 84 ; instinct of, in 

 animals, i. 86. 



Sociality, probable, of primeval 

 men, i. 155 ; influence of, on the 

 development of the intellectual 

 faculties, i. 160 ; origin of, in man, 

 i. 161. 



Soldiers, American, measurements 

 of, i. 114. 



Soldiers and sailors, difference in the 

 proportions of, i. 116. 



Solenostoma, bright colours and mar- 

 supial sack of the females of, ii. 

 22. 



Song of male birds appreciated by 

 their females, i. 63 ; want of, in 

 brilliant plumaged birds, ii. 94 ; of 

 birds, ii. 163. 



Sorex, odour of, ii. 279. 



Sounds admired alike by man anl 

 animals, i. 64 ; produced by fishes, 

 ii. 23 ; produced by male frogs and 

 toads, ii. 27 ; instrumentally pro- 

 duced by birds, ii. 63 et seqq. 



Spain, decadence of, i. 178. 



Sparassus smaragdulus, difference of 

 colour in the sexes of, i. 337, 338. 



Sparrow, pugnacity of the male, 

 ii. 40 ; acquisition of the Linnet's 

 song by a, ii. 55 ; coloration of the, 

 ii. 198 ; immature plumage of tl e, 

 ii. 188. 



Sparrow, white-crowned, young of 

 the, ii. 217. 



Sparrows, house- and tree-, ii. 170. 



Sparrows, new mates found by, ii. 

 105. 



Sparrows, sexes and young of, ii. 

 212 ; learning to sing, ii. 334. 



Spathura Undervcoodi, ii. 77. 



Spawning of fishes, ii. 15, 19. 



Spear, origin of the, i. 234. 



Species, causes of the advancement 

 of, i. 172 ; distinctive characters 

 of, i. 214 ; or races of man, i. 217 ; 

 sterilitv and fertilitv of, when 

 crossed, i. 122 ; supposed, of man, 

 i. 226 ; gradation of, i. 227 ; diffi- 

 culty of defining, i. 228 ; repre- 

 sentative, of birds, ii. 190, 191 ; 

 of birds, comparative differences 

 between the sexes of distinct, ii. 

 192. 



