494 



INDEX. 



DUCKWEED. 



FRUIT-TREES. 



Duckweed, 385. 



Fertility of hybrids, 249. 



Dugong, affinities of, 414. 



from slight changes in conditions, 



Dung-beetles with deficient tarsi, 135. 



267. 



Dyticus, 386. 



of crossed varieties, 267. 





Fir-trees destroyed by cattle, 71. 



E. 



, pollen of, 203. 



Fish, flying, 182. 



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



, teleostean, sudden appearance 



lago, 395. 



of, 305. 



Ears, drooping, in domestic animals, 



eating seeds, 362, 387. 



11. 



, fresh-water, distribution of, 384. 



, rudimentary, 454. 



Fishes, ganoid, now confined to fresh 



Earth, seeds in roots of trees, 361. 



water, 107. 



Eciton, 238. 



, electric organs of, 192. 



Economy of organisation, 147. 



, ganoid, living in fresh water, 321. 



Edentata, teeth and hair, 144. 



of southern hemisphere, 376. 



, fossil species of, 339. 



Flight, powers of, how acquired, 182. 



Edwards, Milne, on physiological divi- 



Flowers, structure of, in relation to 



sions of labour, 115. 



crossing, 97. 



, on gradations of structure, 194. 



of compositas and umbellifera2,144. 



, on embryological characters, 



Forbes, E., on colours of shells, 132. 



418. 



on abrupt range of shells in 



Eggs, young birds escaping from, 87. 



depth, 175. 



Electric organs, 192. 



on poorness of palseontological 



Elephant, rate of increase, 64. 



collections, 287. 



of glacial period, 141. 



on continuous succession of 



Embryology, 439. 



genera, 316. 



Existence, struggle for, 60. 



on continental extensions, 357. 



, conditions of, 206. 



on distribution during glacial 



Extinction, as bearing on natural selec- 



period, 366. 



tion, 109. 



on parallelism in time and space, 



of domestic varieties, 111. 



409. 



, 317. 



Forests, changes in, in America, 74. 



Eye, structure of, 187. 



Formation, Devonian, 334. 



, correction for aberration, 202. 



Formations, thickness of, in Britain, 



Eyes reduced in moles, 137. 



284. 





, intermittent, 290. 



F. 



Formica rufescens, 219. 



sangninea, 219. 



Fabre, M., on parasitic sphex, 218. 



flava, neuter of, 239. 



Falconer, Dr., on naturalisation of 



Frena, ovigerous, of cirripedes, 192. 



plants in India, 65. 



Fresh-water productions, dispersal of, 



on fossil crocodile, 313. 



383. 



on elephants and mastodons, 334. 



Fries on species in large genera being 



and Cautley on mammals of sub- 



closely allied to other species, 57. 



Himalayan beds, 340. 



Frigate-bird, 185. 



Falkland Island, wolf of, 393. 



Frogs on islands, 393. 



Faults, 285. 



Fruit-trees, gradual improvement of, 



Faunas, marine, 348. 



37. 



Fear, instinctive in birds, 212. 



in rinitrrl 9Htr- oc i 



Feet of birds, young molluscs adhering 



, varieties of, acclimatised in 



to, 385. 



United States, 142. 



