DISUSE. 



INDEX. 



DUCKS. 



425 



geographical, as evidence of specific 

 distinctness in man, i. 218. 



Disuse, eftects of, in producing rudi- 

 mentary organs, i. 18 ; and use of 

 parts, effects of, i. 116 ; of parts, 

 influence of, on the races of men, i. 

 247. 



Divorce, freedom of, among the Char- 

 ruas, ii. 372. 



Dixon, E. S., on the habits of the 

 guinea-fowl, i. 270 ; on the pairing 

 of different species of geese, ii. 114 ; 

 on the courtship of peafowl, ii. 

 121. 



DOBRIZHOFFER, ou the marriage-cus- 

 toms of the Alipones, ii. 374. 



Dogs, suffering from Tertian ague, i. 

 13 ; memory of, i. 45 ; domestic, 

 progress of, in moral qualities, i. 50; 

 distinct tones uttered by, i. 54 ; pa- 

 rallelism between his affection for 

 his master and religious feeling, i. 

 68 ; sociability of the, i. 74 ; sym- 

 pathy of, with a sick cat, i. 77 ; 

 sympathy of, with his master, i. 77 ; 

 possible use of the hair on the fore- 

 legs of the, i. 193; racesof the, i. 229; 

 diverging when drawing sledges over 

 thin ice, i. 46 ; dreaming, i. 46, 

 158 ; exercise of reasoning facul- 

 ties by, i. 48 ; their possession of 

 conscience, i. 78 ; numerical pro- 

 portion of male and female births 

 in, i. 304 ; sexual affection between 

 individuals of, ii. 270 ; howling at 

 certain notes, ii. 333 ; rolling in 

 carrion, ii. 281. 



Dolichocephalic structure, possible 

 cause of, i. 148. 



Dolphins, nakedness of, i, 148. 



Domestic animals, races of, i. 229 ; 

 change of breeds of, ii. 369. 



Domestication, influence of, in re- 

 moving the sterility of hybrids, i. 

 222. 



D'Orbigny, a., on the influence of 

 dampness and dryness on tlie colour 

 of the skin, i. 242 ; on the Yura- 

 caras, ii. 347. 



Dotterel, ii. 203. 



Doubledav, E., on sexual diflerences 

 in the wings of butterflies, i. 345. 



Doubledav, H., on the ])roportion 

 of the sexes in the smaller moths, 



i. 311 ; on the attraction of tlie 

 males of Lasiocainpa quei-cus and 

 Saturnla carpini by the female, i. 

 312 ; on the proportion of the sexes 

 in the Lepidoptera, i. 312 ; on the 

 ticking of Anohium tessellatum, i. 

 385 ; on the structure of Ageronia 

 feronia, i. 387 ; on white butter- 

 flies alighting upon paper, i. 400. 



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

 ferences of the Ilemiptcra, i. 349 ; 

 on the colours of British Homo- 

 ]jtera, i. 352. 



Down, of birds, ii. 80. 



Draco, gular appendages of, ii. 33. 



Dragonet, Gemmeous, ii. 7. 



Dragon-flies, caudal appendages of 

 male, i. 344 ; relative size of the 

 sexes of, i. 347 ; diflerence in the 

 sexes of, i. 361; want of pugnacity 

 by the male, i. 364. 



Drake, breeding plumage of the, ii., 

 84. 



Dreams, i. 46 ; a possible source of 

 the belief in spiritual agencies, i. 

 66. 



Drill, sexual difference of colour in 

 the, ii. 291. 



Dromccus irrorahis, ii. 204. 



Dromolxa, Saharan species of, ii. 172. 



Drongo shrike, ii. 179. 



Drongos, racket-shaped feathers in 

 the tails of, ii. 73, 83. 



Dryness, of climate, supposed in- 

 fluence of, on the colour of the 

 skin, i. 242. 



Bri/ojMthecus, i. 199. 



Duck, harlequin, age of mature plu- 

 mage in the, ii. 213 ; breeding in 

 immature plumage, ii. 214. 



Duck, long-tailed, preference of male, 

 for certain females, ii. 122. 



Duck, pintail, pairing with a wigeon, 

 ii. 114^ 



Duck, voice of the, ii. 60 ; pairing 

 with a shield-drake, ii. 114; imma- 

 ture plumage of the, ii. 188. 



Duck, wild, sexual diflerences in the, 

 i. 268 ; speculum and male charac- 

 ters of, i. 291 ; pairing with a pin- 

 tail drake, ii. 115. 



Ducks, dogs and cats recognised by, 

 ii. 110 ; wild, becoming polygamous 

 under partial domestication, i. 270, 



