INDEX. 



625 



ac-jniring the songs of other birds, 

 370 ; on the muscles of the larynx 

 in song birds, 371 ; on the want of 

 the power of song by female birds, 

 +50. 



IJarrow, on the widow-bird, 403. 



Bartels, Dr., supernumerary mamma! 

 in men, 37. 



Bartlett, A. D., period of hatching of 

 birds' eggs, 165 ; on the tragopau, 

 220; on the development of the 

 spurs in CrossoptUo^ auritum, 236 ; 

 on the fighting of the males of 

 Plectropterus gambensis, 364; on 

 the knot, 391 ; on df^ay in male 

 birds, 394 ; on the display of plu- 

 mage by the male Folfiplectrpn, 

 396 ; on Crossoptilon auritum and 

 rhaaiarms WallkhS, 400 ; on the 

 habits of Lopfiophorus, 420 ; on the 

 colour of the mouth in Buceros 

 bwornis, 426 ; on the incubation of 

 the cassowary, 478; on the Cape 

 Buffalo, 508 ; on the use of the 

 horns of antelopes, 509 ; on the 

 fighting of male wart-hogs, 520 ; 

 on Ammotragus tragelaphuSj 531 ; 

 on the colours of Cercopitheous 

 cephuSj 537 ; on the colours of the 

 faces of monkeys, ^50 ; ■ on the' 

 naked surfaces of monkeys, 600. 



Hiirtram, on the couftehip of the 

 male alligator, 351. 



B.isque language, highly artificial, 91. 



Bate, C. S., on the superior activity 

 of male Crustacea, 221 ; on the 

 proportions of the sexes in crabs, 

 255 ; on the chelse of Crustacea, 

 266 ; on the relative size of the 

 sexes in Crustacea, 268 ; on the 

 colours of Crustacea, 270. 



Biteinan, Dr., tendency to imitation 

 in certiiin diseased states, 72 ; on 

 Aphasia, 88. 



Bites, H. W., on variation in the 

 form of the head of Amazonian 

 Indians, 28 ; on, the proportion of 

 the sexes among Amazonian but- 

 terflies, 250 ; on sexual differences 

 in the wings of butterflies, 277 ; 

 on the field - cricket, 283 ; on 

 Fyrodes ptiiclierrimus, 294 ; on the 

 horns of Lamellicorn beetles, 295, 

 297; on the colours of JCpicaliw, 

 fee., 30? ; on the coloration of 



41 



tropical butterflies, 311 ; on th« 

 variability of Papilio Sesostris and 

 Childrma, 320 ; on male and fe- 

 male butterflies inhabiting ditferent 

 stations, 321 ; on mimicry, 323 ; 

 on the caterpillar of a Sphinx^ 325 ; 

 on the vocal organs of the um- 

 brella-bird, 374 ; . on the toucans, 

 492 ; on BraohijUrus calvus, 550. 



Batokas, knocking, out . two upper in* 

 cisors, 575. 



Batrachia, 349 ; eagerness of male, 

 221. 



Bats, scent-glands, 529: sexual dif- 

 ferences in the colour of, 534; fur 

 of male frugivorous, 534. 



Battle, law of, 144; among beetles, 

 299 ; among birds, 360 ; amom; 

 mammals, 500 et seq. ; in man, 

 561. 



Beak, sexual difference in the forms of 

 the, ?59 ; in the colour of the, 383. 



Beaks, of birds, bright colours of, 491. 



Beard, development of, in man, 557 ; 

 analogy of the, in man and the 

 quadrumana, 558 ; variation of the 

 development of the, in different 

 races of men, 559 ; estimation of, 

 among bearded nations, 581 ; pro- 

 bable origin of the, 602. 



, in monkeys, 150 ; of mammals, 



531. 



Beautiful, taste for the, in birds, 410 , 

 in the quadrumana, 540. 



Beauty, sense of, in animals, 92 ; ap- 

 preciation of, ,by birds, 413 ; m- 

 fluence of, 573, 676 ; variability of 

 the standard of, 596. 



Beavan, Lieut., on the development 

 of the horns in Cervus Kldi, 234. 



Beaver, instinct and intelligence of 

 the, 67, 68; voice of the, 527; 

 castoreum of the, 529. 



Beavers, battles of male, 500. 



Bechstein, on female birds choosing 

 the best singers among the males, 

 368 ; on rivalry in song-birds, 369 ; 

 on the singing of female birds, 37u ; 

 on birds acquiring the songs of 

 other birds, 370; on pairing the 

 canary and siskin, 415 ; on a sub- 

 variety of the monk pigeou, 427 ; 

 on spurred hens, 449. 



Beddoe, Dr., on causas of dilTLr'jnce id 

 statare, 31. 



