500 



INDEX. 



RODENTS. 



STRIPES. 



Rodents, blind, 137. 



Silene, fertility of crosses, 257. 



Rudimentary organs, 450. 



Silliman, Prof., on blind rat, 137. 



Rudiments important for classification, 



Skulls of young mammals, 197, 437. 



416. 



Slave-making instinct, 219. 





Smith, Col. Hamilton, on striped horses, 



S. 



164. 



, Mr. Fred., on slave-making ants, 



Sageret on grafts, 262. 



219. 



Salmons, males fighting, and hooked 



, on neuter ants, 239. 



jaws of, 88. 



, Mr., of Jordan Hill, on the de- 



Salt-water, how far injurious to seeds, 



gradation of coast- rocks, 283. 



358. 



Snap-dragon, 161. 



Saurophagus sulphuratus, 183. 



Somerville, Lord, on selection of shee]}, 



Schiodte on blind insects, 138. 



31. 



Schlegel on snakes, 144. 



Sorbus, grafts of, 262. 



Sea-water, how far injurious to seeds, 



Spaniel, King Charles's breed, 35. 



358. 



Species, polymorphic, 46. 



Sebright, Sir J., on crossed animals, 



, common, variable, 53. 



20. 



in large genera variable, 54. 



, on selection of pigeons, 31. 



, groups of, suddenly appearing, 



Sedgwick, Prof., on groups of species 



302, 306. 



suddenly appearing, 302. 



beneath Silurian formations, 306. 



Seedlings destroyed by insects, 67. 



successively appearing, 312. 



Seeds, nutriment in, 77. 



changing simultaneously through- 



, winged, 146. 



out the world, 322. 



, power of resisting salt - water, 



Spencer, Lord, on increase in size of 



358. 



cattle, 35. 



in crops and intestines of birds, 



Sphex, parasitic, 218. 



361. 



Spiders, development of, 442. 



eaten by fish, 362, 387. 



Spitz-dog crossed with fox, 268. 



in mud, 386. 



Sports in plants, 9. 



, hooked, on islands, 392. 



Sprengel, C. C, on crossing, 98. 



Selection of domestic products, 29. 



, on ray-florets, 145. 



, principle not of recent origin, 



Squirrels, gradations in structure, 180. 



33. 



Staffordshire, heath, changes in, 72. 



, unconscious, 34. 



Stag-beetles, fighting, 88. 



, natural, 80. 



Sterility from changed conditions of 



, sexual, 87. 



life, 9. 



, natural, circumstances favourable 



of hybrids, 246. 



to, 101. 



, laws of, 254. 



Sexes, relations of, 87. 



■ , causes of, 263. 



Sexual characters variable, 156. 



from unfavourable conditions, 



selection, 87. 



265. 



Sheep, Merino, their selection, 31. 



of certain varieties, 269. 



, two sub-breeds unintentionally 



St. Helena, productions of, 389. 



produced, 36. 



St. Hilaire, Aug., on classification, 418. 



, mountain, varieties of, 76. 



St. John, Mr., on habits of cats, 91. 



Shells, colours of, 132. 



Sting of bee, 202. 



, littoral, seldom embedded, 288. 



Stocks, aboriginal, of domestic animals, 



, fresh-water, dispersal of, 385. 



18. 



of Madeira, 39 1 . 



Strata, thickness of, in Britain, 284. 



, land, distribution of, 397. 



Stripes on horses, 163. 



