INDEX. 



413 



SPECIFIC. 



nature of, ii. 78, 81, 83, 88, 105, 

 346 ; origin of, ii. 77, 78 ; origin of, 

 by descent, primary importance of 

 the doctrine of, ii. 371 ; progress 

 of the theory of the, ii. 1-114; 

 differences with regard to the, in 

 the two editions of the ' Journal,' 

 ii. 1-5 ; extracts from Note-books 

 on, ii. 5-10 ; first sketch of the, ii. 

 10 ; Essay of 1844 on the, ii. H-i6. 



Specific centres, ii. 82, 83. 



forms, slowness of change of, 



iii. 188. 



Spectator, review of the ' Descent of 

 Man ' in the, iii. 138 ; review of the 

 * Origin ' in the, ii. 296, 297. 



Specularia speculum, self-fertile, iii. 309. 



Spencer, Herbert, an evolutionist, ii. 

 ii. 188 ; appreciation of, iii. 120 ; 

 letter to, on his] Essays, ii. 141 ; 

 letter to, on his articles on Evolu- 

 tion and on Sociology, iii. 165. 



Spencer's ' Principles of Biology,' iii. 



55- 

 Spider-Orchis, possible identity of the, 



with the Bee-orchis, iii. 276. 

 Spirifers, Mr. Salter's illustrations of 



the genealogy of, ii. 367. 

 Spiritualistic seances, iii. 187. 

 Splenic fever, Koch's researches on, 



iii. 234. 

 "Spontaneity," Prof. Bain's principles 



of, iii. 172. 



Spontaneous generation, iii. 180. 

 Sports, iii. 57. 

 Sprengel, C. K., on cross-fertilisation 



of hermaphrodite^ flowers, iii. 257, 



282. 

 , ' Das entdeckte Geheimniss der 



Natur,' i. 90. 

 Squib, serio-comic, by W. H. Harvey, 



ii. 3H- 

 Stag, extinct, horn worked by man, 



ii. 307. 



Stamp-collecting, iii. 5. 

 Stamps, sent by Dr. Asa Gray, ii. 383. 

 Stanhope, Lord, i. 76 ; objections of, 



to Geology and Zoology, i. 377. 

 Stebbing, Rev. T. R. R., lecture on 



'Darwinism,' iii. HO. 

 Stephens, J. F., i. 175. 

 Sterility, in heterostyled plants, iii. 



SURVIVAL. 



296 ; partial, of varieties of Verbascum 

 and Nicotiana when crossed, ii. 384. 



Sterility and natural selection, iii. 80. 



Steudel's ' Nomenclator,' iii. 351. 



Stigmaria, i. 359. 



Stock, effects produced by grafts upon 

 the, iii. 57. 



Stokes, Admiral Lort, reminiscences 

 of C. Darwin, i. 224. 



Strata, older, frequency of generalised 

 forms in the, iii. 169. 



Strickland, H. E., note upon, i. 365 

 note ; letters to, upon the appending 

 of authors' names to those of genera 

 and species, and on the application 

 of the laws of priority, i. 366, 369, 

 372 ; letter from, upon the law of 

 priority and the question of append- 

 ing authors' names to those of genera 

 and species, i. 367. 



Stripes on horses, ii. in ; on the legs 

 of the donkey, ii. 112. 



Strix, special adaptation of, iii. 158. 



' Struggle for Existence,' i. 83 ; ii. 99, 

 123. 



Struthio rhea, i. 249. 



Style, i. 155-157 ; defects of, ii. 157, 

 379- 



Stylidium, sensitive pistil of, iii. 287. 



Suarez, T. H. Huxley's study of, iii. 

 147- 



Sublime, sense of the, iii. 54, 186. 



Submergence of continents, effects of, 

 ii. 75- 



Subsidence, amount of, ii. 77. 



Success, qualities producing, i. 107. 



Sudbrooke, residence at, 1860, ii. 256. 



Suez, antiquity of the isthmus of, ii. 75. 



Suffering, evidence from, as to the 

 existence of God, i. 307, 309, 311. 



Sulivan, Sir B. J., i. 351 ; letters to, on 

 personal matters and on the South 

 American Mission, iii. 126, 128. 



, on Darwin's relation to the 



South American Missionary Society, 

 iii. 127. 



, reminiscences of C. Darwin, i. 



221. 



Surprise, influence of, on breathing, iii. 



141. 

 " Survival of the fittest," Wallace on the 



term, iii. 46. 



