S36 



INBEX. 



Temminck, on distribution aiding 

 classification, 435. 



Tendrils, their development, 332. 



Thompson, Sir W., on the age of 

 the habitable world, 338. 



, on the consolidation of the 



crust of the earth, 483. 



Thouin, on grafts, 290. 



Thrush, aquatic species of, 169. 



, mocking, of the Galapagos, 



421. 



, young of, spotted, 457. 



, nest of, 376. 



Thuret, M., on crossed fuci, 287. 



Thwaites, Mr. , on acclimatization, 

 184. 



Thylacinus, 441. 



Tierra del Fuego, dogs of, 249. 



, plants of, 403. 



Timber-drift, 885. 



Time, lapse of, 814. 



, by itself not causing modi- 

 cation, 95. 



Titmouse, 168. 



Toads on islands, 413. 



Tobacco, crossed varieties of, 305. 



Tomes, Mr., on the distribution 

 of bats, 415. 



Transitions in varieties rare, 159. 



Traquair, Dr., on flat-fish, 233. 



Trautschold, on intermediate 

 varieties, 825. 



Trees on islands belong to pecul- 

 iar orders, 413. 



with separated sexes, 93. 



Trifolium pratense, 68, 88. 



incarnatum, 88. 



Trigonia, 351. 



Trilobites, 838. 



— — , sudden extinction of, 351. 



Trimen, Mr., on imitating-insects, 

 444. 



Trimorphism in plants, 43, 397. 



Troglodytes, 376. 



Tuco-tuQo-blind, 130. 



Tumbler pigeons, habits of, he- 

 reditary, 248. 



Tumbler, young of, 463. 



Turkey-cock, tuft of hair on 

 breast, 83. 



, naked skin on head, 188. 



Turkey-cock, young of, instinct- 

 ively wild, 249. 



Turnip and cabbage, analogous 

 variations of, 149. 



Type, unity of, 197, 198. 



Types, succession of, in same 

 areas, 367. 



Typotherium, 357. 



Udders enlarged by use, 10. 



, rudimentary, 468. 



Ulex, young leaves of, 457. 



Umbelliferse, flowers and seeds 

 of, 138. 



, outer and inner florets of, 



305. 



Unity of type, 197, 196. 



Uria lacrymans, 85. 



Use, effects of, under domestica- 

 tion, 10. 



, effects of, in a state of 



nature, 138. 



Utility, how far important in the 

 construction of each part, 189. 



Valenciennes, on fresh- Vater fish, 

 406. 



Variability of mongrels and 

 hybrids, 305. 



Variation, under domestication, 7. 



caused by reproductive sys 



tem being affected by conditions 

 of life, 8. 



under nature, 39. 



, laws of, 126. 



, correlated, 10, 136, 189. 



Variations appear at correspond- 

 ing ages, 12, 79. 



analogous in distinct spe- 

 cies, 148. 



Varieties, natural, 87. 



, struggle between, 70. 



, domestic, extinction of, 101. 



. transitional, rarity of, 159. 



, when crossed, fertile, 301. 



Varieties, when crossed, sterile 

 803. 



, classification of, 437. 



Verbascum, sterility of, 381. 



, varieties of, crossed, 304. 



Verlot, M., on double stocks, 271. 



