INDEX. 



393 



acquiring' male characters, ii. 172 ; 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. 325. 



BiEKBECK, Mr., on the finding of new 

 mates by Golden Eagles, ii. 100. 



Birthplace of man, i. 191. 



BiETHS, numerical proportions of the sexes 

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

 and female, numerical proportion of, in 

 England, i. 291. 



BiscHOFF, Prof., on the agreement be- 

 tween the brains of man and of the 

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

 dog, i. 15; on the convolutions of the 

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

 difference between the skuUs 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, dwarl^ coloration of the sexes oC 

 u. 170. 



Bisiura 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 dilfurcnco 

 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. 5S; moulting of the, ii. 79; duration 

 of the courtship of the, ii. 96; se.xual 

 difference in coloration of the, ii. 216; 

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

 pheasant, hybrids o^ ii. 109. 



Black-grouse, characters of young, ii. 

 177, 186. 



Blaokwall, 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. 263 ; on 

 the proportion of the sexes in spiders, i. 

 806 ; on sexual variation of color in spi- 

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



Bladdek-nosf, 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, Capt, on the American snipe 

 ii. 61 ; on the dances of Tetrao phagia- 

 nellus, ii. 65. 



Blasius, Dr., on the species of European 

 birds, ii. 119. 



Bled ins taiirus, hornlike processes of male, 

 i. 363. 



Bleeding, tendency to profuse, i. 283. 



Blenkieon, Mr., on sexual preference in 

 horses, ii. 260. 



Blennies, crest developed on the head of 

 male during the breeding-season, ii. 12. 



BUthisa multipunctata, stridulation of, i. 

 368. 



Bloch, on the proportions of the sexes in 

 Fishes, i. 298. 



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



Blood-pheasant, number of spurs in, ii. 

 43. 



Bluebreast, red-throated, sexual differ- 

 ences of the, ii. 187. 



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

 size of the nasal cavities in American 

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

 i. 182; on the number of species of man, 

 i. 218. 



Bltth, E., ob.servations on Indian crows, 

 i. 74; on the structure of the hand in 

 species of If>/!ohate,% 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 

 Gallin uUi cri-siata, ii. 39 ; on the pres- 

 ence of spurs in the female Euploca- 

 mu^ erytkrophthalmu.% 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, .ind Galluti bankiva, ii.^\ on 

 the Indian honey-buzzard, ii. 121; on 

 sexual differences in the color or the eyes 

 of hornbilLs, ii. 123 ; on Orioltm melano- 

 cephalus, ii. 170; on PaimornU Javani- 

 C218, ii. 171 ; on the genus Ardetta, ii, 

 171 ; on the peregrine fhlcon, 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 

 TurnUc, ii. 193; on anomalous young of 

 Zaniiis ritfus and Coli/mbus glacialis, 

 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 Buphus and Annstomits, 

 ii. 208 ; on the young of the blackcap 

 and blackbird, ii, 210; on the young of 

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

 mage of Aiuistonnts, ii. 219 ; on the horns 

 of AntUope beeoartica, ii. 235 ; on the 

 horns of Bovine animals, ii. 236; on the 

 mode of fighting of Om« ot/clooeros, ii. 

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

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

 268; on the colors of Portax picta., ii. 

 274 ; on the colors of AntUope bezoar- 

 tica, ii. 275 ; on the development of the 

 horns in the Koodoo and Eland ante- 

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

 deer, ii. 276; on sexual difference of color 



