498 



INDEX. 



Ramsay, Mr., oil instiuot of cuckoo, 

 236. 



Ratio of increase, 56. 



Rats supplanting each other, 65. 

 acclimatization of, 127. 

 blind, in cave, 123. 



Rattlesnake, 181. 



Reason and instinct, 228. 



Recapitulation, general, 447. 



Reciprocity of crosses, 269. 



Record, geological, imperfect, 293. 



Rengger, on flies destroying cattle, 

 63. 



Reproduction, rate of, 56. 



Resemblance, protective, of insects, 

 201. 

 to parents in mongrels and 

 hybrids, 287. 



Reversion, law of inheritance, 13. 

 in pigeons, to blue color, 141. 



Rhododendron, sterility of, 264. 



Richard, Prof., on Aspicarps, 407. 



Richardson, Sir J., on structure of 

 squirrels, 155. 

 on fishes of the southern hemi- 

 sphere, J74. 



Robinia, grafts of, 272. 



Rodents, blind, 123. 



Rogers, Prof., map of N. America, 

 304. 



Rudimentary organs, 439. 



Rudiments iiiportant for classifica- 

 tion, 407. 



Riitimeyer on Indian cattle, 16, 

 266. 



Salamandre atra, 439. 



Saliva used in nests, 252. 



Salvin, Mr., on the beaks of ducks, 



205. 

 Sageret, on grafts, 272. 

 Salmons, males fighting, and 



hooked jaws of, 77. 

 Salt water, how far injurious to 



seeds, 359. 

 not destructive to land shells, 391. 

 Salter, Mr., on early death of hybrid 



embryos, 275. 

 Saurophagus sulphuratus, 158. 

 Schacht, Prof., on Phyllotaxy, 193. 

 Schiodte. on blind insects, 124. 



on flat-fish, 207. 

 Schlegel, on snakes, 129. 

 Schobl, Dr., on the ears of mice, 



191. 



Scott, J., Mr., on the self -sterility 

 of orchids, 264. 

 on the crossing of varieties of 

 verbascum, 286. 

 Sea water, how far injurious to 

 seeds, 359. 

 not destructive to land shells, 

 391. 

 Seabright, Sir J., on crossed ani- 

 mals, 17. 

 Sedgwick, Prof., on groups of 

 species suddenly appearing, 

 313. 

 Seedlings destroyed by insects, 60. 

 Seeds, nutriment in, 67. 

 winged, 131. 

 means of dissemination, 172, 



180. 

 power of resisting salt water, 359. 

 in crops and intestines of birds, 



362. 

 eaten by fish, 362, 383. 

 in mud, 383. 

 hooked, on islands, 387. 

 Selection of domestic products, 23. 

 principle not of recent origin, 27* 

 unconscious, 28. 

 natural, 69. 

 sexual, 76. 



objections to term, 70. 

 natural, has not induced sterility, 

 273. 

 Sexes, relations of, 76. 

 Sexual characters variable, 138. 



selection, 76. 

 Sheep. Merino, their selection, 25. 

 two sub-breeds, unintentionally 



produced, 29. 

 mountain varieties of, 66. 

 Shells, colors of, 120. 

 hinges of, 172. 



littoral, seldom embedded, 300. 

 fresh-water, long retain the samf 



forms, 341. 

 fresh- water, dispersal of, 381. 

 of Madeira, 486. 

 land, distribution of, 486. 

 land, resisting salt water, 391. 

 Shrew mouse, 413. 

 Silene, infertility of crosses, 269. 

 Silliman, Prof., on blind rat, 123. 

 Sirenia, their affinities, 335. 

 Sitaris, metamorphosis of, 436. 

 Skulls of young mammals, 171, 42& 

 Slave-making instinct, 239. 



