Seite - 551 - in The Origin of Species

INDEX 551 Tail of giraffe, 206. of aquatic animals, 207. , prehensile, 244. • , rudimentary, 494. Tanais, dimorphic, 61. Tarsi, deficient, 148. Tausch, Dr., on umbelliferae, 226. Teeth and hair correlated, 156. , rudimentary, embryonic calf, 490, 518. Tegetmeier, Mr., on cells of bees, 282, 287. Temminck, on distribution aiding classification, 457. Tendrils, their development, 252. Thompson, Sir W., on the age of the habitable world, 360. , on the consolidation of the crust of the earth, 505. Thouin, on grafts, 311. Thrush, aquatic species of, 189. , mocking, of the Galapagos, 443. ^ J „ , young of, spotted, 480. , nest of, 296. Thwaites, Mr., on acclimatisation, 153- Thylacinus, 463. Tierra del Fuego, dogs of, 269. Timber, drift, 407. Time, lapse of, 335. by itself not causing modifica- tion, 114. Titmouse, 188. Toads on islands, 436. Tobacco, crossed varieties of, 326. Tomes, Mr., on the distribution of bats, 437. Transitions in varieties rare, 180. Traquair, Dr., on flat-fish, 242. Trautschold, on intermediate varie- ties, 346. Trees on islands belong to peculiar orders, 435. —— with separated sexes, 1 13. Trifolium pratense, 87, 108. • incarnatum, 108. Trigonia, 372. Trilobites, 360. — ~, sudden extinction of, ^72. Trimen, Mr., on imitating-insects, ^ 4^7. Tnmorphism in plants, 62, 321. Troglodytes, 296. Tuco-tuco, blind, 149. Tumbler-pigeons, habits of, heredi- tary, 268. Tumbler, young of, 484. Turkey-cock, tuft of hair on breast, 103. , naked skin on head, 208. , young of, instinctively wild, 269. Turnip and cabbage, analogous vari- ations of, 168. Type, unity of, 218. Types, succession of, in same areas, 388. Typotherium, 378. U Udders enlarged by use, 29. , rudimentary, 490. Ulex, young leaves of, 480. Umbellifera;, flowers and seeds of, 157- , outer and inner florets of, 225. Unity of type, 218. Uria lacrymans, 105. Use, effects of, under domestica- tion, 29. , effects of, in a state of na- ture, 147. Utility, how far important in the construction of each part, 209. Valenciennes, on fresh-water fish, 428. Variability of mongrels and hy- brids, 326. Variation under domestication, 25. caused by reproductive system being affected by conditions of life, 26, 27. under nature, 58. , laws of, 14s. —— ;, correlated, 29, 155, 209. Variations appear at corresponding ages, 30, 99. analogous in distinct species, 168. Varieties, natural, 58. , struggle between, 90. , domestic, extinction of, 121. —— , transitional, rarity of, 180. , when crossed, fertile, 326. , , sterile, 325. , classification of, 460. Verbascum, sterility of, 302. , varieties of crossed, 325, 326. Verlot, M., on double stocks, 292. Verneuil, M. de, on the succession of species, 374. Vibracula of the Polyzoa, 249. Viola, small imperfect flowers of, 224. — ; — , tricolor, 87. Virchow, on the structure of the crystalline lens, 193. Virginia, pigs of, 98. Volcanic islands, denudation of, 337- Vulture, naked skin on head, 208. W Wading-birds, 430. Wagner, Dr., on Cecidomyia, 478.