490 



INDEX. 



Dana, Prof., on blind cave-animals, 

 125. 

 on relations of crustaceans of 



Japan, 370, 

 on crustaceans of New Zealand, 

 374. 

 Dawson, Dr., on eozoon, 318. 

 De Candolle, Aug. Pyr., on strug- 

 gle for existence, 55. 

 on umbelliferse, 130. 

 on general affinities, 420. 

 De Candolle, Alph., on the varia- 

 bility of oaks, 44. 

 on low plants, widely dispersed, 



397. 

 on widely-ranging plants being 



variable, 48. 

 on naturalization, 99. 

 on winged seeds, 131. 

 on alpine species suddenly be- 

 coming rare, 151. 

 on distribution of plants with 



large seeds, 361. 

 on vegetation of Australia, 376. 

 on fresh-water plants, 382. 

 on insular plants, 487. 

 Degradation of rocks, 296. 

 Denudation, rate of, 297. 

 of oldest rocks, 318. 

 of granite areas, 304. 

 Development of ancient forms, 



341. 

 Devonian system, 339. 

 Dianthus, fertility of crosses, 268. 

 Dimorphism in plants, 40, 280. 

 Dirt on feet of birds, 363. 

 Dispersal, means of, 358. 



during Glacial period, 365. 

 Distribution, goographical, 350. 



means of, 358. 

 Disuse, effect of, under nature, 121. 

 Diversification of means for same 



general purpose, 172. 

 Division, physiological, of labor, 99. 

 Divergence of character, 95. 

 Dog, resemblance of jaw to that of 



the Thylacinus, 414. 

 Dogs, hairless, with imperfect 

 teeth, 10. 

 descended from several wild 



stocks, 15. 

 domestic instincts of, 232. 

 inherited civilization of, 233. 

 fertility of breeds together, 266. 

 fertility of crosses, 283. 



Dogs, proportions of body in dif- 

 ferent breeds, when young, 

 433. 



Domestication, variation under, 6. 



Double flowers, 255. 



Downing, Mr., on fruit-trees in 

 America, 74. 



Dragon flies, intestines of, 164. 



Drift-timber, 361. 



Driver-ant, 257. 



Drones killed by other bees, 183. 



Duck, domestic, wings of, reduced, 

 9. 

 beak of, 204. 

 logger-headed, 157. 



Duckweed, 382. 



Dugong, affinities of, 405. 



Dung-beetles with deficient tarsi, 

 121. 



Dytiscus, 382. 



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

 pelago, 389. 

 Ears, drooping, in domestic ani- 

 mals, 10. 

 rudimentary, 440. 

 Earth, seeds in roots of trees, 361. 



charged with seeds, 363. 

 Echinodermata, their pedicellariaa, 



212. 

 Eciton, 255. 



Economy of organization, 132. 

 Edentata, teeth and hair, 129. 



fossil species of, 462. 

 Edwards, Milne, on physiological 

 division of labor, 99. 

 on gradations of structure, 174. 

 Edwards, on embryological charac- 

 ters, 408. 

 Eggs, young birds escaping from, 



75. 

 Egypt, productions of, not modi- 

 fied, 188. 

 Electric organs, 167. 

 Elephant, rate of increase, 57. 



of Glacial period, 127. 

 Embryology, 427. 

 Eozoon Canadense, 318. 

 Epilepsy inherited, 121. 

 Existence, struggle for, 54. 



condition of, 183. 

 Extinction, 326. 

 as bearing on natural selection, 



105. 

 of domestic varieties, 108. 



