500 
INDEX. 
IIODENTS. 
Rodents, blind, 137. 
Rudimentary organs, 450. 
Rudiments important for classification, 
416. 
S. 
Sagaret on grafts, 262. 
Salmons, males fighting, and hooked 
jaws of, 88. 
Salt-water, how far injurious to seeds, 
358. 
Saurophagus sulphuratus, 183. 
Schiodte on blind insects, 138. 
Schlegel on snakes, 144. 
Sea-water, how far injurious to seeds, 
358. 
Sebright, Sir J., on crossed animals, 
20 . 
-, on selection of pigeons, 31. 
Sedgwick, Prof., on groups of species 
suddenly appearing, 302. 
Seedlings destroyed by insects, 67. 
Seeds, nutriment in, 77. 
-, winged, 146. 
-, power of resisting salt - water, 
358. 
-in crops and intestines of birds, 
361. 
-eaten by fish, 362, 387, 
■-- in mud, 386. 
-, hooked, on islands, 392. 
Selection of domestic products, 29. 
-, principle not of recent origin, 
33. 
-, unconscious, 34. 
-, natural, 80. 
-, sexual, 87. 
-, natural, circumstances favourable 
to, 102. 
Sexes, relations of, 87. 
Sexual characters variable, 156. 
-selection, 87. 
Sheep, Merino, their selection, 31. 
-, two sub-breeds unintentionally 
produced, 36. 
-, mountain, varieties of, 76. 
Shells, colours of, 132. 
--, littoral, seldom embedded, 288. 
--, fresh-water, dispersal of, 385. 
-of Madeira, 391. 
-, land, distribution of, 397. 
STLIIPES. 
Silene, fertility of crosses, 257. 
Silliman, Prof'., on blind rat, 137. 
Skulls of young mammals, 197, 436. 
Slave-making instinct, 219. 
Smith, Col. Hamilton, on striped horses, 
164. 
-, Mr. Fred., on slave-making ants, 
219. 
-, on neuter ants, 239. 
-, Mr., of Jordan Hill, on the de¬ 
gradation of coast*rocks, 283. 
Snap-dragon, 161. 
Somerville, Lord, on selection of sheep, 
31. 
Sorbus, grafts of, 262. 
Spaniel, King Charles’s breed, 35. 
Species, polymorphic, 46. 
-, common, variable, 53. 
-in large genera variable, 54. 
-, groups of, suddenly appearing, 
302, 307. 
-beneath Silurian formations, 307. 
-successively appearing, 312. 
-changing simultaneously through¬ 
out the world, 322. 
Spencer, Lord, on increase in size of 
cattle, 35. 
Sphex, parasitic, 218. 
Spiders, development of, 442. 
Spitz-dog crossed with fox, 268. 
Sports in plants, 9. 
Sprengel, C. C., on crossing, 98. 
-, on ray-florets, 145. 
Squirrels, gradations in structure, 180. 
Staffordshire, heath, changes in, 71. 
Stag-beetles, fighting, 88. 
Sterility from changed conditions of 
life, 9. 
-of hybrids, 246. 
-, laws of, 255. 
-- ——, causes of, 263. 
- from 'unfavourable conditions, 
265. 
-of certain varieties, 269. 
St. Helena, productions of, 390. 
St. Hilaire, Aug., on classification, 418. 
St. John, Mr., on habits of cats, 91. 
Sting of bee, 202. 
Stocks, aboriginal, of domestic animals, 
18. 
Strata, thickness of, in Britain, 284, 
Stripes on horses, 163. 
