420 



INDEX. 



EXISTENCE. 



Currents of sea, rate of, 305. 

 Cuvier, on conditions of existence, 

 191, 192. 



, on fossil monkeys, 266. 



, Fred., on instinct, 191, 192. 



Cyclostoma, resisting salt water, 232. 



D. 



Dana, Pref., on blind cave-animals, 



103. 

 , on relations of crustaceans of 



Japan, 314. 

 , on crustaceans of New Zealand, 



317. 



Dawson, Dr., on eozoon, 269. 

 De Candolle, Aug. Pyr., on struggle 



for existence, 45. 



, on umbelliferse, 108. 



, on general affinities, 356. 



, Alph., on the variability of 



oaks, 37. 

 , on low plants, widely dispersed, 



337. 

 , on widely-ranging plants being 



variable, 40. 



, on naturalisation, 83. 



, on winged seeds, 109. 



, on Alpine species suddenly be- 

 coming rare, 126. 

 , on distribution of plants with 



large seeds, 306. 

 , on vegetation of Australia, 



319, 320. 



, on fresh-water plants, 324. 



, on insular plants, 326. 



Degradation of rocks, 249. 

 Denudation, rate of, 250. 



of oldest rocks, 269. 



of granitic areas, 257. 



Development of ancient forms, 288 



Devonian system, 287. 



Dianthus, "fertility of crosses, 226, 



227. 



Dimorphism in plants, 33, 236. 

 Dirt on feet of birds, 308. 

 Dispersal, means of, 303. 

 during Glacial period, 310. 

 Distribution, geographical, 296. 



, means of, 303. 



Disuse, effect of, under nature, 100. 

 Divergence of character, 80. 

 Diversification of means for same 



general purpose, 144. 

 Division, pnysiological, of labour, 83. 



Dog, resemblance of jaw to that of 



the Thylacinus, 351. 

 Dogs, hairless, with imperfect teeth, 9. 



descended from several wild 



stocks, 14. 



domestic instincts of, 196. 

 inherited civilisation of, 196. 

 fertility of breeds together, 

 225. 



of crosses, 239. 



proportions of body in different 



breeds, when young, 368. 



Domestication, variation under, 5. 



Double flowers, 215. 



Downing, Mr., on fruit-trees hi 



America, 61. 



Dragon-flies, intestines of, 137. 

 Drift- timber, 306. 

 Driver ant, 217. 



Drones killed by other bees, 153. 

 Duck, domestic, wings of, reduced, 8. 



, beak of, 171. 



, logger-headed, 130. 



Duckweed, 323. 

 Dugong, affinities of, 343. 

 Dung-beetles with deficient tarsi, 101. 

 Dytiscus, 324. 



Earl, Mr. "W., on the Malay Archi- 

 pelago, 330. 



Ears, drooping, in domestic animals, 8. 



, rudimentary, 376. 



Earth, seeds in roots of trees, 306. 



charged with seeds, 308. 



Echinodermata, their pedicellariae, 

 178. 



Eciton, 215. 



Economy of organisation, 109. 



Edentata, teeth and hair, 107. 



, fossil species of, 392. 



Edwards, Milne, on physiological 

 division of labour, 83. 



, on gradations of structure, 146. 



, on embryological characters. 



345. 



Eggs, young birds escaping from. 63. 



Egypt, productions of, not modified, 

 157. 



Electric organs, 140. 



Elephant, rate of increase, 47. 



, of Glacial period, 105. 



Embryology, 363. 



Eozoon Canadense, 269. 



Existence, struggle for, 44. 



