INDEX. 



621 



mature plumage, 479; moulting 

 of, 478; aquatic frequency of 

 white plumage in, 488; vocal 

 courtship of, 562; naked skin of 

 the head and neck in, 595. 

 Birgus latro, habits of, 267. 

 Birkbeck, Mr., on the finding of 

 new mates by golden eagles, 403. 

 Birthplace of man, 167. 

 Births, numerical proportions of 

 the sexes in, in animals and 

 man, 210, 211; male and female, 

 numerical proportion of, in 

 England, 237, 

 BischofE, Prof., on the agreement 

 between the brains of man and 

 of the orang, 6; figure of the 

 embryo of the dog, 10; on the 

 convolutions of the brain in the 

 human foetus, 11; on the differ- 

 ence between the skulls of man 

 and the quadrumana, 145; re- 

 semblance between the ape's 

 and man's, 194. 

 Bishop, J., on the vocal organs of 

 frogs, 346; on the vocal organs 

 of corvine birds, 366; on the 

 trachea of the Merganser, 369. 

 Bison, American, co-operation of, 



98; mane of the male, 517. 

 Bitterns, dwarf, coloration of the 



sexes of, 454. 

 Biziura lobata, musky odor of the 

 male, S55; large size of male, 

 358. 

 Blackbird, sexual differences in 

 the, 214; proportion of the sexes 

 in the, 243; acquisition of a song 

 by, 366; color of the beak in the 

 sexes of the, 377, 487; pairing 

 with a thrush, 409; colors and 

 nidiflcation of the, 449; young of 

 the, 487; sexual difference in col- 

 oration of the, 487. 

 Black-buck, Indian, sexual differ- 

 ence in the color of the, 531. 

 Blackcap, arrival of the male, be- 

 fore the female, 208; young of 

 the, 482. 

 Black-cock, polygamous, 215; pro- 

 portion of the sexes in the, 243; 

 pugnacity and love-dance of the, 

 359; call of the, 370; moulting of 

 the, 386; duration of the court- 

 ship of the, 400; and pheasant, 

 hybrids of, 409; sexual difference 

 in coloration of the, 491; crimson 

 eye-cere of the, 487. 

 Blacklock, Dr., on music, 567. 

 Black-grouse, characters of 



young, 459, 465. 

 Blackwall, J., on the speaking of 

 the magpie, 87; on the desertion 

 of their young by swallows, 104; 

 on the superior activity of male 

 spiders, 217; on the proportion 

 of the sexes in spiders, 251; on 

 sexual variation of color in 

 spiders, 269; on male spiders, 

 269. 



Bladder-nose Seal, hood of the, 

 523. 



Blaine, on the affections of dogs, 

 619. 



Blair, Dr., on the relative liability 

 of Europeans to yellow fever, 

 189. 



Blake, C. C, on the jaw from La 

 Naulette, 39. 



Blakiston, Capt., on the American 

 snipe, 373; on the dances of 

 Tetrao phasianellus, 376. 



Blasius, Dr., on the species of 

 European birds, 416. 



Bledius taurus, hornlike processes 

 of male, 296. 



Bleeding, tendency to profuse, 232. 



BJenkiron, Mr., on sexual prefer- 

 ence in horses, 520. 



Blennies, crest developed on the 

 head of males, during the breed- 

 ing season, 336. 



Blethisa multipunctata, stridula- 

 tion of, 300. 



Bloch, on the proportions of the 

 sexes in fishes, 244. 



Blood, arterial, red color of, 258. 



pheasant, number of spurs 



in, 360. 



Bluebreast, red-throated, sexual 

 differences of the, 466. 



Blumenbach, on Man, 27; on the 

 large size of the nasal cavities 

 in American aborigines, 33; on 

 the position of man, 145; on the 

 number of species of man, 170. 



Blyth, B., on the structure of the 

 hand in the species of Hylo- 

 bates, 49; observations on Indian 

 crows, 99; on the development of 

 the horns in the Koodoo and 

 Eland antelopes, 229; on the pug- 

 nacity of the males of Gallinula 

 cristata, 357; on the presence of 

 spurs in the female Euplocamus 

 erythrophthalmus, 360; on the 

 pugnacity of the amadavat, 362; 

 on the spoonbill, 370; on the 

 moulting of Anthus, 386; on the 

 moulting of bustards, plovers, 

 and Gallus bankiva, 387; on the 

 Indian honey-buzzard, 418; on 

 sexual differences in the color of 

 the eyes of hornbills. 420; on 

 Oriolus melanocephalus, 454; on 

 Palseornis javanicus, 455; on the 

 genus Ardetta, 455; on the pere- 

 grine falcon, 465; on young fe- 

 male birds acquiring male char- 

 acters, 455; on the immature 

 plumage of birds, 459; on repre- 

 sentative species of birds, 462; 

 on the young of Turnix, 470; on 

 anomalous young of Lanius 

 rufus and Colymbus glacialis, 

 477; on the sexes and young of 

 the sparrows, 477; on dimor- 

 phism in some herons, 479; on 

 the ascertainment of the sex of 

 nestling bullfinches by pulling 



