r ARROW. 
INDEX. 
BECnSTEIX. 
411 
the song of birds, ii. 52 ; on the 
singing of female birds, ii. 54 ; on 
birds acquiring the songs of other 
birds, ii. 55 ; on the muscles of the 
larynx in song-birds, ii. 55 ; on the 
want of the power of song by female 
birds, ii. 163. 
Barrow, on the widow-bird, ii. 98. 
Bartlett, A. D., on the tragopan, i. 
270 ; on the development of the 
spurs in Crossoptilon auritum, i. 
290 ; on the fighting of the males 
of Plectropterus gambensis, ii. 46 ; 
on the knot, ii. 82 ; on display in 
male birds, ii. 87 ; on the display 
' of plumage by the male Polyplec- 
iron, ii. 89 ; on Crossoptilon auri- 
tum and Phasianus Wallichii^ ii. 
93 ; on the habits of LophopTiorus, 
ii. 121 ; on the colour of the mouth 
in Buceros hicornis, ii. 129 ; on the 
incubation of the cassowary, ii. 
204 ; on the Cape Buffalo, ii. 250 ; 
on the use of the horns of ante- 
lopes, ii. 251 ; on the fighting of 
male wart-hogs, ii. 266 ; on Ammo- 
tragus tragelapiius, ii. 282 ; on the 
colours of Cercopithecus cephus^ ii. 
291 ; on the colours of the faces of 
monkeys, ii. 310 ; on the naked 
surfaces of monkeys, ii. 377. 
Bartram, on the courtship of the 
male alligator, ii. 29. 
Basque language, highly artificial, 
i. 61. 
Bate, C. S., on the superior activity 
of male Crustacea, i. 272; on the 
proportions of the sexes in crabs, i. 
315 ; on the chelae of Crustacea, i. 
330 ; on the relative size of the 
sexes in Crustacea, i. 332 ; on the 
colours of Crustacea, i. 335. 
Bates, H. W., on variation in the 
form of the head of Amazonian 
Indians, i. Ill ; on the proportion 
of the sexes among Amazonian but- 
terflies, i. 309 ; on sexual differ- 
ences in the wings of butterflies, i. 
345 ; on the field-cricket, i. 353 ; 
on Pyrodes pulcherrimuSj i. 367 ; 
on the horns of Lamellicorn beetles, 
i. 370, 371 ; on the colours of Epi- 
calisdy &c., i. 388 ; on the colora- 
tion of tropical butterflies, i. 391 ; 
on the variability of Papilio Sesos- 
tris and Childrenm, i. 402 ; on male* 
and female butterflies inhabiting 
different stations, i. 403 ; on mi- 
mickry, i. 411 ; on the caterpillar 
of a Sphinx, i. 416 ; on the vocal 
organs of the umbrella-bird, ii. 58 
on the toucans, ii. 227 ; on Brachy^ 
urus calvus, ii. 309. 
Batokas, knocking out two upper in- 
cisors, ii. 340. 
Batrachia, ii. 25 ; eagerness of male, 
i. 272. 
Bats, sexual differences in the colour 
of, ii. 286. 
Battle, law of, i. 182 ; among beetles, 
i. 375 ; among birds, ii. 40 ; among, 
mammals, ii. 239 et seq. ; in man, 
ii. 323. 
Beak, sexual difference in the forms, 
of the, ii. 39 ; in the colour of the,, 
ii. 72. 
Beaks, of birds, bright colours of, ii.. 
227. 
Beard, development of, in man, ii. 
317 ; analogy of the, in man and 
the quadrumana, ii. 319 ; variation 
of the development of the, in diffe- 
rent races of men, ii. 321 ; estima- 
tion of, among bearded nations, ii. 
349 ; probable origin of the, ii. 
379. 
Beards, in monkeys, i. 192 ; of mam- 
mals, ii. 282. 
Beautiful, taste for the, in birds, 
ii. 108 ; in the quadrumana, ii. 
296. 
Beauty, sense of, in animals, i. 63 * 
appreciation of, by birds, ii. Ill 
influence of, ii. 338, 343; varia- 
bility of the standard of, ii. 370. 
Beat AN, Lieut., on the development 
of the horns in Cervus Eldi, i. 288. 
Beaver, instinct and intelligence of 
the, i. 37, 38 ; voice of the, ii. 277 \ 
castoreum of the, ii. 279. 
Beavers, battles of male, ii. 239. 
Bechstein, on female birds choosing 
the best singers among the males, 
ii. 52 ; on rivalry in song-birds, ii. 
53 ; on the singing of female birds, 
ii. 54 ; on birds acquiring the songs, 
of other birds, ii. 55 ; on pairing 
the canary and siskin, ii. 115 ; ou 
