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Show 490 CONCLUSION. CHAP. XIV. ditions of life and from use and disuse ; a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one ; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved. ( 491 ) INDEX. ABERRANT, A. ABERRANT groups, 429. Abyssinia, plants of, 375. Acclimatisation, 139. Affinities of extinct species, 329. --of organic beings, 411. Agassiz on Amblyopsis, 139. -- on groups of species suddenly appearing, 302, 305. -- on embryological succession, 338. -- on the glacial period, 366. --on embryological characters, 418. -- on the embryos of vertebrata 439. ' -- on parallelism of embryological development and geological succes~ sion, 449. Algre of New Zealand, 376. Alligators, males, fighting, 88. Amblyopsis, blind fish, 139. America, North, productions allied to those of Enrope, 371. ----, boulders and glaciers of 373. ' --, South, no modern formations on west coast, 290. Ammonites, sudden extinction of, 321. Anagallis, sterility of, 247. Analogy of variations, 159. Ancylus, 386. Animals, not domesticated from being variable, 17. --, domestic, descended from several stocks, 19. ----, acclimatisation of, 141. --of Australia, 116. -- with thicker fur in cold climates, 133. --, blind, in caves, 137. --, extinct, of Australia, 339. Anomma, 240. Antarctic islands, ancient flora of, 399. Antirrhinum, 161. Ants attending aphides, 211. -,slave-making instinct, 219. BEES, Ants, neuter, structure of, 236. Aphides attended by ants, 211. Aphis, development of, 442. Apteryx, 182. Arab horses, 35. Aralo-Caspian Sea, 339. Archiac, M. de, on the succession of species, 325. Artichoke, J erusalem, 142. Ascension, plants of, 389. Asclepias, pollen of, 193. Asparagus, 359. Aspicarpa, 417. Asses, striped, 163. Ateuchus, 135. Audubon on habits of frigate-bird, 185. --on variation in birds'-nests, 212. -- on heron eating seeds, 387. Australia, animals of, 116. --,dogs of, 215. --, extinct animals of, 309. --, European plants in, 375. Azara on flies destroying cattle, 72. Azores, flora of, 363. B. Babington, Mr., on British plants, 48. Balancement of growth, 147. Bamboo with hooks, 197. Barberry, flowers of, 98. Barrande, M., on Silurian colonies 313. ' -- on the suceession of species, 325. -- on parallelism of palreozoic forma~ tions, 328. -- on affinities of ancient species, 330. Barriers, importance of, 34 7. Batrachians on islands, 393. Bats, how structure acquired, 180. --, distribution of, 394. Bear, catching water-insects, 184. Bee, sting of, 202. --, queen, killing rivals, 202. Bees fertilising flowers, 73. |