On the Origin of Species

INDEX. 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 succession, 449. Algæ of New Zealand, 376. Alligators, males, fighting, 88. Amblyopsis, blind fish, 139. America, North: productions allied to those of Europe, 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. 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, Jerusalem, 142. Ascension, plants of, 389.