Seite - 543 - in The Origin of Species

INDEX 543 Bogs, inherited civilisation of, 268. —— , fertility of breeds together, 305- of crosses, 322. —— , proportions of body in differ- ent breeds, when young, 484. Domestication, variation under, 25. Double flowers, 292. Downing, Mr., on fruit-trees in America, 98. Dragon-flies, intestines of, 194. Drift-timber, 407. Driver ant, 294. Drones killed by other bees, 214. Duck, domestic, wings of, reduced,29. —^— , beak of, 237. , logger-headed, 186. Duckweed, 429. Dugong, affinities of, 453-. Dung-beetles with deficient tarsi, 148. Dytiscus, 429. E Earl, Mr. W., on the Malay Archi- pelago, 437. Ears, drooping, in domestic animals, 29- , rudimentary, 494. Earth, seeds in roots of trees, 407. • charged with seeds, 409. Echinodermata, their pedicellari;e, 246. Eciton, 292. Economy of organisation, 159. Edentata, teeth and hair, 156. • , fossil species of, 515. _ Edwards, Milne, on physiological division of labour, 126. • , on gradations of structure, 20;. on embryological characters. 456. Eggs, young birds escaping from, 100. Egypt, productions of, not modified, 220. Electric organs, 198. Elephant, rate of increase, 79. , of Glacial period, 154. Embryology, 478. EoEoon Canadense, 360. Existence, struggle for, 76. , condition of, 218. Extinction, as bearing on natural selection, 134. - —— of domestic varieties, 130. . 368. Eye, structure of, 191. , correction for aberration, 216. Eyes, reduced in moles, 149. Fabre, M., on hymenoptera fighting, 102. , on parasitic sphcx, 275. t , on Sitaris, 487, 488. Falconer, Dr., on naturalisation of plants in India, 80. on e'ephants and mastodons, 383. and Cautley, on mammals of sub-Himalayan beds, 389. Falkland Islands, wolf of, 436. Faults, 338. Faunas, marine, 397. Fear, instinctive, in birds, 269. Feet of birds, young molluscs ad- hering to, 429. Fertilisation variously effected, 203, 211. Fertility of hybrids, 302. , from slight changes in con- ditions, 318. of crossed varieties, 322. Fir-trees destroyed by cattle, 86. , pollen of, 215. Fish, flying, 187. , teleostean, sudden appearance °^' 357: , eating seeds, 408, 430. -, fresh-water, distribution of, 427, 428. Fishes, ganoid, now confined to fresh water, 118. , electric organs of, 198. , ganoid, living in fresh water, 372. , of southern hemisphere, 421. Flat-fish, their structure, 240. Flight, powers of, how acquired, 186, 187. Flint-tools, proving antiquity of man, 35. Flower, Prof., on the larynx, 246. , on Halitherium, 378. , on the resemblance between the jaws of the dog and Thylaci- nus, 464. , on the homology of the feet of certain marsupials, 473. Flowers, structure of, in relation to crossing, 106. , of compositae and umbelliferse, 157. 225- , beauty of, 211. doub'e, 292. Flysch formation, destitute of or- ganic remains, 341. Forbes, Mr. D., on glacial action in the Andes, 418. , E., on colours of shells, 146. , on abiupt range of shells in depth, 181. -, on poorness of palseontological collections, 340. , on continuous succession of genera, 367. , on continental extensions, 404, 405- -, on distribution during Glacial period, 412. -, on parallelism in time and space, 448.