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On the Origin of Species By Means of Natural Selection

Page 379 of 406, printed 379

on colours of shells, 132. on abrupt range of shells in depth, 175. on poorness of pal ontological collections, 287. on continuous succession of genera, 316. on continental extensions, 357. on distribution during glacial period, 366 on parallelism in time and space, 409. Forests, changes in, in America, 74. Formation, Devonian, 334. Formations: thickness of, in Britain, 284. intermittent, 290. Formica rufescens, 219. Formica sanguinea, 219. Formica flava, neuter of, 239. Frena, ovigerous, of cirripedes, 192. Fresh-water productions, dispersal of, 383. Fries on species in large genera being closely allied to other species, 57. Frigate-bird, 185. Frogs on islands, 393. Fruit-trees: gradual improvement of, 37. in United States, 85. varieties of, acclimatised in United States, 142. Fuci, crossed, 258. 379
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