Seite - 544 - in The Origin of Species

544 INDEX Forests, changes in, in America, 88. Formation, Devonian, 382. , Cambrian, 360. Formations, thickness of, in Britain, 338- , intermittent, 348. Formica, rufescens, 277. , sanguinea, 276. , flava, neuter of, 293. Forms, lowly organised, long endur- ing, 136, 137. ^ . . , Frena, ovigerous, of cirnpedes, 196. Fresh-water productions, dispersal of, 427. Fries, on species in large genera being closely allied to other spe- cies, 73- Frigate-bird, 189. Frogs on islands, 436. Fruit-trees, gradual improvement of, 51- in United States, 98. , varieties of, acclimatised in United States, 154. Fuci, crossed, 308, 314. Fur, thicker in cold climates, 146. Galapagos Archipelago, birds of, 434. ^ . , productions of, 439, 440. Galaxias, its wide range, 427. Galeopithecus, 185. Game, increase of, checked by ver- min, 84. Gartner, on sterility of hybrids, 299, 300, 305. , on reciprocal crosses, 308. , on crossed maize and verbas- cum, 325. -, on comparison of hybrids and mongrels, 327, 328. Gaudry, Prof., on intermediate gen- era of fossil mammals in Attica, 378. Geese, fertility when crossed, 304. , upland, 189. Geikie, Mr., on subaerial denuda- tion, 336. Genealogy, important in classifica- tion, 457. Generations, alternate, 478. Geoffroy St. Hilaire, on balance- ment, 158. , on homologous organs, 473. , Isidore, on variability of re- peated parts, 160. -, on correlation, in monstrosi- ties, 29. , on correlation, 156. , on variable parts being often monstrous, 165. Geographical distribution, 395. Geology, future progress of, 527. , imperfection of the record, 527. Gervais, Prof., on Typotherium, 378. Giraffe, tail of, 206. —•— , structure of, 230. Glacial period, 411. , affecting the North and South, 415- Glands, mammary, 244. Gmelin, on distribution, 412. Godwin-Aui^ten, Mr., on the Malay Archipelago, 352. Goethe, on compensation of growth, 158. Gomphia, 227. Gooseberry, grafts of, 311. Gould, Dr. Aug. A., on land-shells, 438. , Mr., on colours of birds, 146. , on instincts of cuckoo, 273. , on distribution of genera of birds, 445. Gourds, crossed, 325. Graba, on the TJria lacrymas, 105. Grafting, capacity of, 310, 311. Granite, areas of denuded, 345. Grasses, varieties of, 124. Gray, Dr. Asa, on the variability of oaks, 66. , on man not causing variabil- ity, 93- , on sexes of the holly, 107. , on trees of the United States, 113- , on naturalised plants in the United States, 125. , on KStivation, 226. , on Alpine plants, 412. , on rarity of intermediate va- rieties, 182. , Dr. J. E., on striped mule. 171- Grebe, 189. Grimm, on asexual reproduction, ^ -^78. , Groups, aberrant, 468. Grouse, colours of, 98. , red, a doubtful species, 64. Growth, compensation of, 158. Giinther, Dr., on flat-fish, 244. , on prehensile tails, 244. , on the fishes of Panama, 396. , on the range of ftesh-water fishes, 427. , on the limbs of Lepidosiren, 492. H Haast, Dr., on glaciers of New Zea- land, 418. Habit, effect of, under domestica- tion, 29. , effect of, under nature, 148. , diversified, of same species, 187. Hackel, Prof., on classification and the lines of descent, 472. Hair and teeth, correlated, 156. Halitherium, 378.