452 



ON THE ORIGIN OF SPECIES 



Richardson, Sir J., on fishes of 

 the southern hemisphere, 337. 



Robinia, grafts of, 235. 



Rodents, blind, 124. 



Rudimentary organs, 404. 



Rudiments important for classi- 

 fication, 374. 



Sagaret on grafts, 235. 



Salmons, males fighting, and 



hooked jaws of, 80. 

 Salt-water, how far injurious to 



seeds, 322. 

 Saurophagus sulphuratus, 165. 

 Schiodte on blind insects, 125. 

 Schlegel on snakes, 130. 

 Sea-water, how far injurious to 



seeds, 322. 

 Sebright, Sir J., on crossed 



animals, 19. 



on selection of pigeons, 29. 



Sedgwick, Prof., on groups of 



species suddenly appearing, 271. 

 Seedlings destroyed by insects, 



63. 

 Seeds, nutriment in, 71. 



winged, 133. 



power of resisting salt-water, 



322. 

 — — in crops and intestines of 



bird3, 325. 



eaten by fish, 325, 347. 



in mud, 347. 



hooked, on islands, 352. 



Selection of domestic products, 



27. 

 principle not of recent origin, 



31. 



unconscious, 32. 



natural, 73. 



sexual, 79. 



natural, circumstances 



favourable to, 92. 



Sexes, relations of, 79. 



Sexual characters variable, 142. 



selection, 79. 



Sheep, merino, their selection, 29. 



two sub-breeds unintention- 

 ally produced, 33. 



mountain, varieties of, 70. 



Shells, colours of, 120. 



littoral, seldom embedded, 



258. 



fresh-water, dispersal of, 344. 



of Madeira, 350. 



land, distribution of. 357. 



Silene, fertility of crosses, 231. 

 Silliman, Prof., on blind rat, 125. 

 Skulls of young mammals, 177, 



392. 

 Slave-making instinct, 196. 

 Smith, Col. Ilamilton, on striped 



horses, 149. 



Mr. Fred., on slave-making 



ants, 197. 



■ on neuter ants, 215. 



Mr., of Jordan Hill, on the 



degradation of coast-rocks, 254. 



Snap-dragon, 146. 



Somerville, Lord, on selection of 



sheep, 29. 

 Sorbus, grafts of, 235. 

 Spaniel, King Charles's breed, 32. 

 Species, polymorphic, 43. 



common, variable, 50. 



in large genera variable, 51. 



groups of, suddenly appear- 

 ing, 271, 274. 



beneath Silurian formations, 



275. 

 successively appearing, 280. 



changing simultaneously 



throughout the world, 289. 



Spencer, Lord, on increase in size 



of cattle, 33. 

 Sphex, parasitic, 196. 

 Spiders, development of, 397. 

 Spitz-dog crossed with fox, 240. 

 Sports in plants. 9. 

 Sprengel, C. C, on crossing, 89. 



on ray-florets, 132. 



Squirrels, gradations in structure, 



162. 

 Staffordshire heath, changes in, 



66. 

 Stag-beetles, fighting, 80. 

 Sterility from changed conditions 



of life, 8. 



. . of hybrids, 221. 



laws of, 228. 



causes of, 236. 



. — - from unfavourable conditions, 



238. 



■ of certain varieties, 242. 



St. Helena, productions of, 350. 

 St. Hilaire, Aug., on classification, 



376. 

 St. John. Mr., on habits of cats, 



83. 

 Sting of bee, 182. 



Stocks, aboriginal, 

 animals, 16. 



of domestio 



