4G4 
SLAVES. 
INDEX. 
SPECIES. 
Slaves, difference between those of 
field and house, i. 246. 
Smell, sense of, in man and animals, 
i. 23. 
Smith, Adam, on the basis of sym- 
pathy, i. 82. 
Smith, .Sir A., on the recognition of 
women by male Cynocephali , i. 13; 
on an instance of memory in a 
baboon, i. 45 ; 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 
Kobus 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, on the Cynipid® and Ten- 
thredinidaj, i. 314; on the relative 
size of the sexes of Aculeate Hyme- 
noptera, i. 347 ; on the difference 
bet ween the sexes of ants and bees, I 
i. 365 ; on the stridulation of 
Trox sabulosus, i. 380; on the stri- [ 
'382^ 011 °*' ^ onm y c ^ U8 P seu ^ a< ^ r h 
Smyuthurus luteus, courtship of, i. 
348. r 
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, solitaiy, 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, io 
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. I 1 4. 
Soldiers and sailors, difference in the 
proportions of, i. 116. 
fiolenoxtoma, 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 and 
animals, i. 64; produced by fishes, 
ii. 23 ; produced by male frogs and 
toads, ii. 27 ; instrumen tally pro- 
duced by birds, ii. 63 et seqq. 
Spain, decadence of, i. 178. 
Sparassus smaragduhu? , 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 
the, ii. 217. 
Sparrows, house- and tree-, ii. 170. 
j Sparrows, new mates found by, ii* 
| 105. 
j Sparrows, sexes and young of, ii* 
212; learning to sing, ii. 334. 
, Spatkura Ohderwoodi , 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 » 
sterility and fertility of, when 
crossed, i. 122 ; supposed, of m»n» 
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, 11 • 
192. 
