INDEX 



819 



graphical, as evidence ol specific 

 distinctness in man, 226. 



.fiisuse, efEects of, in producing rudi- 

 mentary organs, 29; and use of 

 parts, effects of, 53; of parts, in- 

 fluence of, on the races of men, 

 261. 



Divorce, freedom of, among the Char- 

 ruas, 769. 



Dixon, j;. S., on the pairing of different 

 species of geese, 535 ; on the court- 

 ship of peafowl, 542. 



Dobrizhoffer, on the marriage-customs 

 of the Abipones, 7T0. 



Dobson, Dr., on the Cheiroptera, 288; 

 scent-glands of bats, 683; frugivo- 

 Tous bats, 689-690. 



Dogs, suffering from tertian ague, 24; 

 memory of, 106; dreaming, 106; di- 

 verging when drawing sledges over 

 thin ice, lOT; exercise of reasoning 

 faculties by, 110-111; domestic prog- 

 ress of, in moral qualities, 114; dis- 

 tinct tones uttered by, 119; paral- 

 lelism between his affection for his 

 master and religious feeling, 133 ; 

 sociability of the, 138; sympathy 

 of, with a sick cat, 141; sympathy 

 of, with his master, 141; their pos- 

 session of conscience, 142; possible 

 use of the hair on the forelegs of 

 the, 203 ; races of the, 235 ; nu- 

 merical proportion of male and fe- 

 male births in, 323 ; sexual affection 

 between individuals of, 611 ; howl- 

 ing at certain notes, 132 ; rolling in 

 carrion, 685. 



Dolichocephalic structure, possible 

 cause of, 82. 



Dolphins, nakedness of, 83. 



Domestic animals, races of, 235 ; change 

 of breeds of, T66-76T. 



Domestication, influence of, in remov- 

 ing the sterility of hybrids, 229- 

 230. 



D'Orbigny, A., on the influence of 

 dampness and dryness on the color 

 of the skin, 256 ; on the Yuracaras, 

 746. 



Dotterel, 616. 



Doubleday, B., on sexual differences in 

 the wings of butterflies, 365. 



, H., on the proportion of the sexes 



in the smaller moths, 331; on the 

 attraction of the males of Lasio- 



campa quercus and Saturnia carpini 

 by tlje female, 333; on the propor- 

 tion of the sexes in the Lepidoptera, 

 333 ; on the ticking of Anobium tes- 

 selatum, 400; on the structure of 

 Ageronia feronia, 402 ; on white but- 

 terflies alighting upon paper, 414. 



Douglas, J. W., on the sexual differ- 

 ences of the Hemiptera, 369 ; on the 

 colors of British Homoptera, 372. 



Down of birds, 504-605. 



DracQi gular appendages of, 461. 



Dragonet, Gremmeous, 437. 



Dragon-flies, caudal appendages of 

 male, 364; relative size of the sexes 

 of, 367 ; difference in the sexes of, 

 381 ; want of pugnacity by the male, 

 382. 



Drake, breeding plumage of the com- 

 mon, 507. 



Dreams, 106; a possible source of the 

 belief in spiritual agencies, 131. 



Drill, sexual difference of color in the, 

 695. 



Dromseus, irroratus, 617. 



Droraolgea, Saharan species of, 588. 



Drongo shrike, 694. 



Drongos, racket-shaped feathers in the 

 tails of, 497, 606. 



Dryness, of climate, supposed influence 

 of, on the color of the skin, 266. 



Dryopitheous, 208. 



Duck, harlequin, age of mature plu- 

 mage in the, 624 ; breeding in imma- 

 ture plumage, 625. 



, long-tailed, preference of male, 



for certain females, 542. 



, pintail, pairing with a widgeon, 



536. 



, voice of the, 485 ; pairing with a 



shield-drake, 636 ; immature plu- 

 mage of the, 601-602. 



, wild, sexual differences in the, 



289; speculum and male characters 

 of, 311 ; pairing with a pintail drake, 

 626. 



Ducks, wild, becoming polygamous 

 under partial domestication, 290; 

 dogs and cats recognized by, 532. 



Dufoss^, Dr., sounds produced by fish, 

 451. 



Dugong, nakedness of, 83; tusks o^ 

 648. 



Dujardin, on ihe relative size of the 

 cerebral ganglia in insects, 80. 



