INDEX, 721 



of the hen, 418; on the object of the song of birds, 419; on the sing- 

 ing of female birds, 420; on birds acquiring the songs of other 

 birds, 420; on the muscles of the larynx in song birds, 421; on the 

 want of the power of song by female birds, 513. 



Barrow, on the widow- bird, 457. 



Bartels, Dr., supernumerary mammae in men, 42. 



Bartlett, A. D., period of hatching of bird's eggs, 187; on the 

 tragopan, 249; on the development of the spurs in CrossoptUon 

 auritum, 267; on the fighting of the males of Plectropterus gamben 

 sis, 414; on the knot, 444; on display in male birds, M7; on the dis- 

 play of plumage by the male Polyplectron, 449 ; on CrossoptUon 

 auritum and P/uisianus WaUiehii, 454; on the habits of Lophophorus, 

 477; on the color of the mouth in Buceros bicornis, 484; on the incu- 

 bation of the cassowary, 544; on the Cape Buffalo, 580; on the use 

 of the horns of antelopes, 580; on the fighting of male wart-hogs, 

 593; on Ammotrag^is tragekiphus, 606; on the colors of Cercopithecits 

 cephus, 614; on the colors of the faces of monkeys, 629; on the 

 naked surfaces of monkeys, 686. 



Bartlett, on courting of Argus pheasant, 454. 



Bartram, on the courtship of the male allegator, 398. 



Basque language, highly artificial, 102. 



Bate, C, S., on the superior activity of male Crustacea, 250; on the 

 proportions of the sexes in crabs, 2^; on the chelae of Crustacea, 301; 

 on the relative size of the sexes in Crustacea, 302; on the colors of 

 Crustacea, 306. 



Bateman, Dr., tendency to imitation in certain diseased states, 82; 

 on Aphasia, 100. 



Bates, H. W., on variations in the form of the head of Amazonian 

 Indians, 32; on the proportion of sexes among Amazonian butter- 

 flies, 283; on sexual differences in the wings of butterflies, 314; on 

 the field-cricket, 321; on Pyrodes pulcJierrimus, 333; on the horns of 

 Lamellicorn beetles, 334, 336; on the colors of Epicaliw, etc., 350; on 

 the coloration of tropical butterflies, 352: on the variability of Papilio 

 Sesostris and ChUdrena, 362; on male and female butterflies inhabit- 

 ing different stations, 364; on mimicry, 366; on the caterpillar of a 

 Sphinx, 369; on the vocal organs of the umbrella-bird, 423; on the 

 toucans, 560; on Brachyurus caZmis, 629. 



Batokas, knocking out two upper incisors, 656. 



Batrachia, 395; eagerness of male, 250. 



Bats, scent-glands, 604; sexual differences in the color of, 610; fur 

 of male frugivorous, 610. 



Battle, law of, 163; among beetles, 339; among birds, 408; among 

 mammals, 570 et seq.j in man, 640. 



Beak, sexual difference in the forms of the, 408; in the color of 

 the, 435. 



Beaks, of birds, bright colors of, 559. 



Beard, development of, in man, 635; analogy of the, in man and 

 the quadrumana, 636; variation of the development of the, in dif- 

 ferent races of men, 637; estimation of, among bearded nations, 663; 

 probable origin of the, 688; in monkeys, 171; of mammals, 607. 



Beautiful, taste for the, in birds, 466; in the quadrumana, 617. 



Beauty, s*^nse of, in animals, 104; appreciation of, by birds, 469; 

 influence of , 654, 657; variability of the standard of, 681; sense of. 

 guflSciently permanent for action of sexual selection, 563, 712. 



