INDEX. 



631 



dimentary organs, 11; and use 

 o£ parts, effects of, 31; of parts, 

 influence of, on the races of 

 men, 192. 



Divorce, freedom of, among; the 

 Charruas, 592. 



Dixon, B. S., on the pairing of dif- 

 ferent species of geese, 409; on 

 the courtship of peafowl, 414. 



Dobrizhoffer, on the marriage- 

 customs of the Abipones, 593. 



Dobson, Dr., on the Cheiroptera, 

 214; scent-glands of bats, 524; 

 frugivorous bats, 529. 



Dogs, suffering from Tertian 

 ague, 8; memory of, 72; dream- 

 ing, 72; diverging when drawing 

 sledges over thin ice, 73; exer- 

 cise of reasoning faculties by, 

 75; domestic, progress of In 

 moral qualities, 78; distinct 

 tones uttered by, 82; parallelism 

 between his affection for his 

 master and religious feeling, 93; 

 sociability of the, 97; sympathy 

 of, with a sick cat, 100; sympa- 

 thy of, with his master, 100; 

 their possession of conscience, 

 100; possible use of the hair on 

 the fore-legs of the, 147; races 

 of the, 172; numerical proportion 

 of male and female births in, 

 240; sexual affection between in- 

 dividuals of, 519; howling at cer- 

 tain notes, 563; rolling in car- 

 rion, 525. 



Dolicliooephalic structure, possi- 

 ble cause of, 54. 



Dolphins, nakedness of, 54. 



Domestic animals, races of, 172; 

 change of breeds of, 590. 



Domestication, influence of, in re- 

 moving the sterility of hybrids, 

 168. 



D'Orbigny, A., on the influence of 

 dampness and dryness on the 

 color of the skin, 188; on the 

 Turacaras, 574. 



Dotterel, 477. 



Doubleday, B., on sexual differ- 

 ences in the wings of butterflies, 

 274. 



, H., on the proportion of the 



sexes in the smaller moths, 247; 

 males of Lasiocampa quercus 

 and on the attraction of the Sa- 

 turnia carpini by the female, 

 252; on the proportion of the 

 sexes in the Lepidoptera, 248; on 

 the ticking of Anobium tessel- 

 atum, 307; on the structure of 

 Ageronla feronia, 305; on white 

 butterflies alighting upon paper, 

 314. 



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

 ferences of the Hemiptera, 278; 

 on the colors of British Homop- 

 tera, 280. 



Down, of birds, 385. 



Draco, gular appendages of, 350. 



Dragon-et, Gemmeors, 332. 



Dragon-flies, caudal appendages 

 of male, 274; relative size of the 

 sexes of, 276; difference in the 

 sexes of, 287; want of pugnacity 

 by the male, 288. 



Drake, breeding plumage of the, 

 387. 



Dreams, 72; a possible source of 

 the belief in spiritual agencies, 

 91. 



Drill, sexual difference of color 

 in the, 533. 



DromEeus irroratus, 472. 



Dromolsea, Saharan species of, 

 460. 



Drongo shrike, 464. 



Drongos, racket-shaped feathers 

 in the tails of, 379, 387. 



Dryness, of climate, supposed In- 

 fluence of, on the color of the 

 skin, 188. 



Dryopithecus, 151. 



Duck, harlequin, age of mature 

 plumage in the, 478; breeding in 

 Immature plumage, 479. 



, long-tailed, preference of 



male, for certain females, 415. 



, pintail, pairing with a widg- 

 eon, 409. 



voice of the, 369; pairing 



with a shield-drake, 409; imma 

 ture plumage of the, 461. 



-, wild, sexual differences in 



the, 214; speculum and male 

 characters of, 231; pairing with 

 a pintail drake, 410. 



Ducks, wild, becoming polygam- 

 ous under partial domestication, 

 215; dogs and cats recognized 

 by, 406. 



Dufosse, Dr., sounds produced by 

 flsh, 343. 



Dugong, nakedness of, 54; tusks 

 of, 498. 



Dujardin, on the relative size of 

 the cerebral ganglia in insects, 

 52. 



Duncan, Dr., on the fertility of 

 early marriages, 134; compara- 

 tive health of mai;ried and sin- 

 gle, 136. 



Dupont, M., on the occurrence of 

 the supra-condyloid foramen in 

 the humerus of man, 21. 



Durand, J. P., on causes of varia- 

 tion, 29. 



Dureau de la Malle, on the songs 

 of birds, 84; on the acquisition 

 of an air by blackbirds, 356. 



Dutch, retention of their color by 

 the, in South Africa, 188. 



Duty, sense of, 94. 



Duvaucel, female Hylobates 

 washing her young, 68. 



Dyaks, pride of, in mere homi- 

 cide, 113. 



Dynastes, large size of males of, 

 276. 



Dynastini, stridulation of, 30O. 



