SEBRIGHT. 



INDEX. 



STOCKS. 



455 



Sebright, Sir J., on crossed animals, 



15. 



Sedgwick, Prof., on groups of species 



suddenly appearing, 282. 

 Seedlings destroyed by insects, 53. 

 Seeds, nutriment in, 60. 



, winged, 117. 



., means of dissemination, 154, 



161, 327, 328. 

 . } power of resisting salt water, 



325. 

 , , in crops and intestines of 



birds, 326, 327. 



, eaten by fish, 327, 346. 



in mud, 345. 



, hooked, on islands, 349. 



Selection of domestic products, 22. 

 . , principle not of recent origin, 



27. 



, unconscious, 27. 



>, natural, 62. 



, sexual, 69. 



, objections to term, 63. 



natural, has not induced ste- 

 rility, 247. 

 Sexes, relations of, 69. 

 Sexual characters variable, 123. 



selection, 69. 



Sheep, Merino, their selection, 23. 

 -> two sub-breeds, unintentionally 



produced, 26. 

 -, mountain varieties of, 59. 



Shells, colours of, 107 

 •, hinges of, 154 



littoral, seldom embedded, 270. 

 — , fresh-water, long retain the 

 same forms, 308. 



— >, fresh- water, dispersal of, 344. 

 — , of Madeira, 349. 

 — , land, distribution of, 349. 

 -, land, resisting salt water, 325. 



Shrew-mouse, 373. 

 Silene, infertility of crosses, 243. 

 Silliman, Prof.* on blind rat, 110. 

 Sirenia, their affinities, 302. 

 Sitaris, metamorphosis of, 394. 

 Skulls of young mammals, 159, 384. 

 Slave-making instinct, 216. 

 Smith, Col. Hamilton, on striped 



horses, 129. 

 • , Mr. Fred., on slave-making 



ants, 217. 



, on neuter ants, 231. 



Smitt, Dr., on the Polyzoa, 193. 



Snake with tooth for cutting through 



egg-shell, 214. 

 Somerville, Lord, on selection of 



sheep, 23. 

 Sorbus, grafts of, 246. 

 Sorex, 373. 



Spaniel, King Charles's breed, 25. 

 Specialisation of organs, 98. 

 Species, polymorphic, 35. 



, dominant, 43. 



, common, variable, 42. 



in large genera variable, 44. 



, groups of, suddenly appearing, 



282, 285. 

 beneath Silurian formations, 



287. 



successively appearing, 290. 



changing simultaneously 



throughout the world, 297. 

 Spencer, Lord, on increase in size of 



cattle, 26. 

 , Herbert, Mr., on the first steps 



in differentiation, 100. 



on the tendency to an equili- 



brium in all forces, 252 

 Sphex, parasitic, 216. 

 Spiders, development of, 390. 

 Sports in plants, 8. 

 Sprengel, C. C, on crossing, 76. 



, on ray-florets, 116. 



Squalodon, 302. 



Squirrels, gradations in structure, 



139. 

 Staffordshire, heath, changes in, 55. 

 Stag-beetles, fighting, 69. 

 Star-fishes, eyes of, 144. 



, their pedicellariae, 192. 



Sterility from changed conditions of 



life, 7. 



of hybrids, 236. 



, laws of, 241. 



, causes of, 247. 



from unfavourable conditions, 



250. 



not induced through natural 



selection, 247. 



St. Helena, productions of, 347. 



St. Hilaire, Aug., on variability of 

 certain plants, 174. 



, on classification, 368. 



St. John, Mr., on habits of cats, 209. 



Sting of bee, 163. 



Stocks, aboriginal, of domestic ani- 

 mals, 14. 



