722 INDEX. 



Beavan, Lieut., on the development of the horns in Cervus Eldi, 265; 



Beaver, instinct and intelligence of the, 75, 77; voice of the, 602. 

 castoreum of the, 604. 



Beavers, battles of male. 570. 



Bechstein, on female birds choosing the best singers among the 

 males, 418; on rivalry in song-birds, 419; on the singing of female 

 birds, 420; on birds acquiring the songs of other birds, 420; on pair- 

 ing the canary and siskin, 472; on a sub-variety of the monk pigeon, 

 472; on spurred hens, 511. 



Beddoe, Dr., on causes of difference in stature, 35. 



Bee-eater, 421. 



Bees, 113; pollen-baskets and stings of, 70; destruction of drones 

 and queens by, 120; female, secondary sexual characters of, 35; 

 proportion of sexes, 286; difference of the sexes in color and sexual 

 selection, 331. 



Beetle, luminous larva of a, 314. 



Beetles, 333; size of the cerebral ganglia in, 61; dilatation of the 

 fore tarsi in male, 312; blind, 333; stridulation of, 341. 



Belgium, ancient inhabitants of, 207. 



Bell, Sir C., on the emotional muscles in man, 4; "snarling mus- 

 cles," 46; on the hand, 57; Bell, T., on the numerical proportion of 

 the sexes in moles, 279; on the newts, 394; on the croaking of the 

 frog, 395; on the difference in the coloration of the sexes in Zoatoca 

 mvipara, 405; on moles fighting, 570. 



Bell-bird, sexual difference in the color of the, 440. 



Bell -birds, colors of, 560. 



Belt, Mr., on the nakedness of tropical mankind, 64; on a spider- 

 monkey and eagle, 115; habits of ants, 168; Lampyridae distasteful 

 to mammals, 314; mimicry of Leptalidcs, 368; colors of Nicaraguan 

 frogs, 396; display of humming-birds, 508; on the toucans, 560; pro- 

 tective coloring of skunk, 621. 



Benevolence manifested by birds, 467. 



Bennett, A. W., attachment of mated birds, 466; on the habits of 

 Dromceus irroratua, 545; Bennett, D., on birds of paradise, 449. 



Berbers, fertility of crosses with other races, 195. 



Bernicla Antarctica, colors of, 560. 



Bernicle gander pairing with a Canada goose, 471. 



Bert, M., crustaceans distinguish colors, 306. 



Bettoni, E., on local differences in the nests of Italian birds, 519. 



Beyle, M., see Bombet. 



Bhoteas, color of the beard in, 637. 



Bhringa, disciform tail-feathers of, 445. 



Bianconi, Prof., on structures as explained through mechanical 

 principles, 27. 



Bibio, sexual differences in the genus, 317. 



Bichat, on beauty, 667. 



Bickes, proportion of sexes in man, 274. 



Bile, colored in many animals, 296. 



Bimana, 170. 



Birds, imitations of the songs of other birds by, 82: dreaming, 84; 

 killed by telegraph wires, 90; language of. 97: sense of beauty in, 

 104; pleasure of, in incubation, 119; male, incubation by, 185; and 

 reptiles, alliance of, 187; sexual differences in the beak of some, 236; 



