INDEX. 



393 



acquiring male characters, ii. 1T2 ; breed- 

 ing in immature plumage, ii. 205 ; moult- 

 ing of, ii. '204; aquatic, frequency of 

 white plumage in, ii. 219; vocal court- 

 ship of, ii. 315; naked skin of the head 

 and neck in, ii. 377. 



Birgus latro, habits of, i. 825. 



Birkbeck, Mr., on the finding of new 

 mates by Golden Eagles, ii. 100. 



Birthplace of man, i. 191. 



Births, numerical proportions of the sexes 

 in, in animals ana man, i. 255, 256 ; male 

 and female, numerical proportion of, in' 

 England, i. 291. 



Bischoff, Pref., on the agreement be- 

 tween the brains of man and of the 

 Orang, i. 10 ; figure of the embryo of the 

 dcg. i. 15; on the convolutions of the 

 brain in the human fetus, i. 16; on the 

 difference between the skulls of man and 

 the quadrumana, i. 183. 



Bishop. J., on the vocal organs of frogs, ii. 

 26 ; on the vocal organs of corvine birds, 

 ii. 52 ; on the trachea of the Merganser, 

 ii. 57. 



Bison, American mane of the male, ii. 255. 



Bitterns, dwarf, coloration of the sexes of, 

 ii. 170. 



BUtiura lobata, musky odor of the male, 

 ii. 36; large size of male ; ii. 41. 



Blackbird, sexual differences in the, i. 

 260; proportion of the sexes in the, i. 

 296 ; acquisition of a song by a, ii. 52 ; 

 color of the beak in the sexes of the, ii. 

 69, 217 ; pairing with a thrush, ii. 109 ; 

 colors and nidification of the, ii. 162; 

 young of the, ii. 210 ; sexual difference 

 in coloration of the, ii. 216. 



Black-buck. Indian, sexual difference in 

 the color of the. ii. 275.' 



Blackcap, arrival of the male, before the 

 female, i. 251 ; young of the. ii. 210. 



Black-cock, polygamous, i. 261 ; propor- 

 tion of the sexes in the. i. 297 ; pugnacity 

 and love-dance of the, ii. 42 ; call of the, 

 ii. 53 ; moulting of the, ii. 79 ; duration 

 of the courtship of the, ii. 96; sexual 

 difference in coloration of the, ii. 216 ; 

 crimson eye-cere of the. ii. 217; and 

 pheasant, hybrids of ii. 109. 



Black-grouse, characters of young, ii. 

 177, 186. 



Blackwall, J., on the speaking of the 

 magpie, i. 57 ; on the desertion of their 

 young by swallows, i. 80 ; on the supe- 

 rior activity of male spiders, i. 2JJ3; on 

 the proportion of the sexes in spiders, i. 

 306 ; on sexual variation of color in spi- 

 ders, i. 327 ; on male spiders, i. 328. 



Bladder-nose Seal, hood of the, ii. 265. 



Blaine, on the affections of dogs, ii. 258. 



Blair, Dr., on the relative liability of Eu-' 

 ropeans to yellow fever, i. 234. 



Blake, C. C, on the jaw from La Naulette, 

 i. 122. 



Blakiston. Cupt., on the American snipe 

 ii. 61 : on the dances of Tttrao phasia- 

 neltiu;, ii. 65. 



Blastus, Dr., on the species of European 

 birds, ii. 119. 



Bledi its tu iiruf,, hornlike processes of malfl, 

 i. 363. 



Bleeding, tendency to profuse, i. 2S3. 



Blenkiron. Mr., on sexual preference _n 

 horses, ii. 260. 



Blennies, crest developed on the head of 

 male during the breeding-season, ii. 12. 



Blethisa multipunctata, stridulation of, L 

 363. 



Block, on the proportions of the sexes in 

 •Fishes, i. 293. 



Blood, arterial, red color of, i. 314. 



Blood-pheasant, number of spurs in, ii. 

 43. 



Blcebreast. red-throated, sexual differ- 

 ences of the, ii. 137. 



Blumenbach, on Man, i. 107 ; on the large 

 6ize of the nasal cavities in American 

 aborigines, i. 114; on the position of man, 

 i. 1S2; on the number of species of man, 

 i. 213. 



Blyth, E., observations on Indian crows, 

 i. 74; on the structure of the hand in 

 species of Hylobates, i. 135; on the as- 

 certainment of the sex of nestling bull- 

 finches by pulling out breast-feathers, ii. 

 23 ; on the pugnacity of the males of 

 Gallinula cristata, ii. 39 ; on the pres- 

 ence of spurs in the female Euploca- 

 mus eri/throphthalmm, ii. 44; on the 

 pugnacity of the amadavat, ii. 47 ; on the 

 spoonbill, ii. 57; on the moulting of An- 

 thus, ii. 79 ; on the moulting of bustards, 

 plovers, and GcUlus bankiva, ii. SO; on 

 the Indian honey-buzzard, ii. 121 ; on 

 sexual differences in the color or the eyes 

 of hornbills, ii. 123; on Oriolus melano- 

 cephalm, ii. 170; on Palazornia Javani- 

 cu.% ii. 171 ; on the genus Ardetta, ii. 

 171 ; on the peregrine falcon, ii. 171 ; on 

 young female birds acquiring male char- 

 acters, ii. 172; on the immature plu- 

 mage of birds, ii. 177; on representative 

 species of birds, ii. 182; on the young of 

 Turnix, ii. 193 ; on anomalous young of 

 Lanius rufus and Colymbus gla<:in!is, 

 ii. 202 ; on the sexes and young of the 

 sparrows, ii. 203 ; on dimorphism in some 

 herons, ii. 205; on orioles breeding in 

 immature plumage, ii. 205; on the sexes 

 and young of Buphns and Anastomus, 

 ii. 20S ; on the young of the blackcap 

 and blackbird, ii, 210; on the- young of 

 the stonechat, ii. 211; on the white plu- 

 mage of AiKistomus. ii. 219 ; on the horns 

 of Antilope bezoartica, ii. 235 ; on the 

 horns of Bovine animals, ii. 236 ; on tho 

 mode of fighting of (hm eydoceros, ii. 

 238; on the voice of the Gibbons, ii. 263; 

 on the crest of the male wild-goat, ii. 

 268; on the colors of Portux picta, iL 

 274; on the colors of Antilope bezoar- 

 tica, ii. 275; on the development of the 

 horns iD the Koodoo and Eland ante- 

 lopes, i. 279 ; on the color of the Axis 

 deer, ii. 276 ; on sexual difference of color 



