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 446 CUVIER. im)EX. EXTINCTION. Cuvier, on fossil monkeys, 283, 284., Fred., on instinct, 205. Cyclostoma, resisting salt water, 353. D. Dana, Prof., on blind cave-animals. 111. , on relations of crustaceans of Japan, 334. , on crustaceans of New Zea- land, 338. Dawson, Dr., on eozoon, 287. De Candolle, Aug. Pyr., on struggle for existence, 49. , on umbelliferae, 116, , on general affinities, 379. De Candolle, Alph., on the variability of oaks, 40. , on low plants, widely dispersed, . y on widely-ranging plants being variable, 43. , on naturalisation, 89. , on winged seeds, 117. , on Alpine species suddenly be- coming rare, 135. y on distribution of plants with large seeds, 326. , on vegetation of Australia, 340. , on fresh-water plants, 345. -, on insular plants, 347. Degradation of rocks, 266. Denudation, rate of, 268. • of oldest rocks, 287. of granitic areas, 274. Development of ancient forms, 307. Devonian system, 305. Dianthus, fertility of crosses, 243. Dimorphism in plants, 35, 252. Dirt on feet of birds, 328. Dispersal, means of, 323. during Glacial period, 330. Distribution, geographical, 316. , means of, 323. Disuse, effects of, under nature, 108. Divergence of character, 86. Diversification of means for same general purpose, 153. Division, physiological, of labour, 89. Dog, resemblance of jaw to that of the Thylacinus, 374. Dogs, hairless, with imperfect teeth, 9. descended from several wild stocks, 15. , domestic instincts of, 210. Dogs, inherited civilisation of, 210. , fertility of breeds together, 241. , of crosses, 256. -, proportions of body in different breeds, when young, 392. Domestication, variation under, 5. Double flowers, 230. Downing, Mr., on fruit-trees in Ame- rica, 66, Dragon-flies, intestines of, 147. Drift-timber, 326. Driver-ant, 232. Drones killed by other bees, 164. Duck, domestic, wings of, reduced, S., beak of, 183, , logger-headed, 140. Duckweed, 344. Dugong, affinities of, 365. Dung-beetles with deficient tarsi, 108. Dytiscus, 345. . Earl, Mr. W., on the Malay Archipe- lago, 351. Ears, drooping, in domestic animals, 8. y rudimentary, 400. Earth, seeds in roots of trees, 326. charged with seeds, 328. Echinodermata, their pedicellaria;, 191. Eciton, 230. Economy of organisation, 117. Edentata, teeth and hair, 115. , fossil species of, 417. Edwards, Milne, on physiological division of labour, 89. , on gradations of stnicture, 156. , on embryological characters, . Eggs, young birds escaping from, 6S. Egypt, productions of, not modified. 169. Electric organs, 150. Elephant, rate of increase, 51. , of Glacial period, 113. Embryology, 386. Eozoon Canadense, 287. Epilepsy inherited, 108. Existence, struggle for, 48. — —, conditions of, 167. Extinction, as bearing on natural selection, 96. of domestic varieties, 93. , 293.