INDEX 



807 



mankind, 84; on a spider-monkey 

 and eagle, 140 ; habita of ants, 198 ; 

 Lampyridffl distasteful to mammals, 

 365 ; mimicry of Leptolides, 423 ; col- 

 ors of Nicaraguan frogs, 454 ; display 

 of humming-birds, 571; on the tou- 

 cans, 635; protective coloring of 

 skunk, '701. 



Benevolence, manifested by birds, 531. 



Bennett, A. W., attachment of mated 

 birds, 530; on the habits of Dromseus 

 irroratus, 617. 



, Dr., on birds of paradise, 511. 



Berbers, fertility of crosses with other 

 races, 228. 



Bernicla autarctica, colors of, 635. 



Bernicle gander pairing with a Canada 

 goose, 535. 



Bert, M., crustaceans distinguish colors, 

 357. 



Bertillon, M., arrested development and 

 polydactylism, 60. 



Bettoni, B., on local differences in the 

 nests of Italian birds, 588. 



Beyle, M., see Bombet. 



Bhoteas, color of the beard in, 719. 



Bhringa, disciform tail-feathers of, 606. 



Bianconi, Prof., on structures as ex- 

 plained through mechanical princi- 

 ples, 44. 



Bibio, sexual differences in the genus, 

 368. 



Bichat, on beauty, 752. 



Bickes, proportion of sexes in man, 319. 



Bile, colored, in many animals, 346. 



Bimana, 200. 



Birds, imitations of the songs of other 

 birds by, 104; dreaming, 106; killed 

 by telegraph wires, 113; language 

 of, 121; sense of beauty in, 128; 

 pleasure of, in incubation, 143 ; male, 

 incubation by, 218 ; and reptiles, al- 

 liance of, 220 ; sexual differences in 

 the beaks of some, 276; migratory, 

 arrival of the male before the fe- 

 male, 280; apparent relation be- 

 tween polygamy and marked sexual 

 differences in, 290 ; monogamous, be- 

 coming polygamous under domesti- 

 cation, 290; eagerness of male in 

 pursuit of the female, 291; wild, 

 numerical proportion of ^ the sexes 

 in, 326; secondary sexual charac- 

 ters of, 466 ; difference of size in the 

 sexes of, 471; fights of male, wit- 

 nessed by females, 477 ; display of 



male, to captivate the females, 47 T; 

 close attention of, to the songs of 

 others, 479; acquiring the song of 

 their foster-parents, 481 ; brilliant, 

 rarely good songsters, 482; love- 

 antics and dances of, 492; colora- 

 tion of, 499 et seq. ; moulting of, 

 504 et seq. ; unpaired, 525 ; male, 

 singing out of season, 629; mutual 

 affection of, 530 ; in confinement, dis- 

 tinguish persons, 531; hybrid, pro- 

 duction ^of, 535; Albino, 541; Euro- 

 pean, number of species of, 545; 

 variability of, 546 ; geographical dis- 

 tribution of coloring, 646; gradation 

 of secondary sexual characters in, 

 654; obscurely colored, building con- 

 cealed nests, 585 ; young female ac- 

 quiring male characters, 695 ; breed- 

 ing in immature plumage, 624; 

 moulting of, 625 ; aquatic, fre- 

 quency of white plumage in, 636; 

 vocal courtship of, 730; naked skin 

 of the head and neck in, 773. 



Birgus latro, habits of, 356. 



Birkbeck, Mr., on the finding of new 

 mates by golden eagles, 527. 



Birthplace of man, 208. 



Births, numerical proportions of the 

 sexes in, in animals and man, 284- 

 286; male and female, numerical 

 proportion of, in England, 319. 



Bischoffi, Prof., on the agreement be- 

 tween the brains of man and of the 

 orang, 22 ; figure of the embryo of 

 the dog, 27 ; on the convolutions of 

 the brain in the human foetus, 28; 

 on the difference between the skulls 

 of man and the quadrumana, 200; 

 resemblance between the ape's and 

 man's, 264. 



Bishop, J., on the vocal organs of 

 frogs, 455; on the vocal organs 

 of corvine birds, 481; on the tra- 

 chea of the Merganser, 485. 



Bison, American, co-operation of, 139; 

 mane of the male, 673. 



Bitterns, dwarf, coloration of the sexes 

 of, 594. 



Biziura lobata, musky odor of the male, 

 466; large size of male, 471. 



Blackbird, sexual differences in the, 

 289; proportion of the sexes in 

 the, 327; acquisition of a song by, 

 481 ; color of the beak in the sexes 

 of the, 496, 634; pairing with a 



