426 
DUGONG. 
INDEX. 
ELLIOT. 
Dugong, tusks of, ii. 242 ; nakedness 
of, i. 148. 
Dujardin, on the relative size of the 
cerebral ganglia in insects, i. 145. 
Duncan, Dr., on the fertility of early 
marriages, i. 174. 
Dupont, M., on the occurrence of the 
supra-condyloid foramen in the hu- 
merus of man, i. 29. 
Durand, J. P., on causes of varia- 
tion, i. 113. 
Dureau de la Malle, on the songs of 
birds, i. 55; on the acquisition of 
an air by blackbirds, ii. 55. 
Dutch, retention of their colour by 
the, in South Africa, i. 242. 
Duty, sense of, i. 70. 
Duvaucel, female Hylobates washing 
her young, i. 40. 
Dyaks, pride of, in mere homicide, i. 
94. 
Dynastes, large size of males of, i. 
347. 
Dynastini, stridulation of, i. 381. 
Dytiscus, dimorphism of females of, 
i. 343 ; grooved elytra of the fe- 
male, i. 343. 
E. 
Eagle, "young Cercopithecus rescued 
from, by the troop, i. 75. 
Eagle, white-headed, breeding in 
immature plumage, ii. 214. 
Eagles, golden, new mates found by, 
ii. 105. 
Ear, motion of the, i. 20 ; external 
shell of the, useless in man, i. 21 ; 
rudimentary point of the, in man, 
i. 22. 
Ears, piercing and ornamentation of 
the, ii. 341. 
Echidna, i. 201. 
Echini, bright colours of some, i. 322. 
Echinodermata, absence of secon- 
dary sexual characters in, i. 321. 
Ecker, figure of the human embryo, 
i. 15 ; on sexual differences in the 
pelvis in man, ii. 317 ; on the pre- 
sence of a sagittal crest in Austra- 
lians, ii. 319. 
Edentata, former wide range of, in 
America, i. 219 ; absence of secon- 
dary sexual characters in, i. 268. 
Edolius, racket-shaped feathers in, ii- 
73. 
Edwards, Mr., on the proportion of 
the sexes in North American species 
of Papilio, i. 309. 
Egerton, Sir P., on the use of the 
antlers of deer, ii. 252 ; on the 
pairing of red deer, ii. 269 ; on the 
bellowing of stags, ii. 275. 
Eggs, hatched by male fishes, ii. 20. 
Egret, Indian, sexes and young of, ii, 
217. 
Egrets, breeding plumage of, ii. 82 ; 
white, ii. 228. 
Ehrenberg, on the mane of the male 
Hamadryas baboon, ii. 267. 
Ekstrom, M., on Harelda glacialis, ii, 
122 . 
Elachista 7'ufocinerea, habits of male, 
i. 311. 
Eland, development of the horns of 
the, i. 289. 
Elands, sexual differences of colour 
in, ii. 288. 
Elaphomyia, sexual differences in, i, 
349. 
Elaphrus idiginosus, stridulation of, 
i. 379. 
Elaps, ii. 31. 
Elaterid^, proportions of the sexes- 
in, i. 313. 
Elaters, luminous, i. 345. 
Elephant, i. 200 ; nakedness of the, 
i. 148 ; rate of increase of the, i. 
135 ; Indian, polygamous habits of 
the, i. 267 ; pugnacity of the male, 
ii. 240 ; tusks of, ii. 242, 243, 248, 
249, 258 ; Indian, mode of fighting, 
of the, ii. 257 ; male, odour emitted 
by the, ii. 279 ; attacking white or 
grey horses, ii. 295. 
Elevation of abode, modifying in- 
fluence of, i. 120. 
Elimination of inferior individuals, 
i. 172. 
Elk, ii, 249 ; winter change of the, 
ii. 299. 
Elk, Irish, horns of the, ii. 259. 
Ellice Islands, beards of the natives, 
ii. 322, 349. 
Elliot, K., on the numerical pro- 
portion of the sexes in young rats, 
i. 305 ; on the proportion of the 
sexes in sheep, i. 305. 
