502 



INDEX 



America, not likely to occur in Eng- 

 land, ii. 386 



Statistics, of births and deaths, i. 5° 5 

 Asa Gray's N. American plant-, 

 i. 432-4 



Steinheim, Lias rocks of, i. 347 



Stellaria media, cross-fertilisation of, 

 ii. 414 



Stephens, Miss Catherine, i. 6 



Sterile, use of term, i. 48, 411 



Sterility, accumulation through Natural 

 Selection, i. 297, 298 ; arguments re- 

 lating to, i. 293 ; artificial production 

 of, i. 223 ; between allied species 

 aided by Natural Selection, i. 288 ; 

 connection with sexual differentiation, 

 i. 223 ; and crossing, i. 230, 231, 295 ; 

 domestication and loss of, i. 274, 

 387 ; experiments on, i. 224, 226 ; 

 of hybrids, i. 287-93, 295-9; in 

 human beings, i. 224, 225 ; Huxley 

 on, i. 225, 230, 231 ; increase of 

 races and, i. 294 ; laws governing, 

 i. 288 ; Natural Selection and, i. 2S9, 

 296 ; in pigeons, i. 222 ; in plants, 

 ii. 347, 348 (see also self-sterility) ; 

 reciprocal crosses and unequal, i. 

 2 93> 2 94 5 selection and, i. 288 ; 

 variations in amount of, i. 291 ; varie- 

 ties and, i. 294 



Stirling, and Huxley, i. 316 



Stokes, Sir G., ii. 443 



Strasburger, on fertilisation of grasses, 

 ii. 291 



Stratification, and cleavage, ii. 200, 202, 

 208 



Strephium, vertical position of leaves, 

 ii. 364 



Strezlecki, i. 89 



Strickland, H., letters to, i. 67-70 ; on 

 zoological nomenclature, i. 67-9 



Stripes, loss and significance of, ii. 63 



Structural dissimilarity, and sterility 



1 2 95 



Structure, external conditions in relation 



to, i. 306 

 Struggle for existence, i. 165, 192, 268 ; 



and crossing, i. 288 ; factors concerned 



in, i. 326 ; and hybrids, i. 290-92 ; J. 



Scott on, i. 239 

 Strychnos, F. Miiller on, ii. 345 

 Student, Darwin as an Edinburgh, i. 



Studer, B., on cleavage and foliation, 



ii. 200, 201 

 Studien zur Desccndenz-Theorie, Weis- 



mann's, i. 356 

 Studies in the Theory of Descent, Mel- 



dola's translation of Weismann's 



book, i. 350 



Study of Sociology, II. Spencer's, i. 351 



Stur, ID., ii. 141 



Style, Darwin on, i. 220; ii. 2, 322 ; 

 Darwin on Huxley's, i. 237 ; effect 

 of controversy on, ii. 155 



Suivda, bloom on, ii. 411 



Submergence, i. 90, 91 



Subsidence, evidence of, i. 56, 209, 

 467 ; coral reefs and, ii. 227 ; and 

 elevation, ii. 123, 136, 13S, 147 ; 

 equable nature of, ii. 189 ; large areas 

 simultaneously affected by, ii. 138 ; 

 in oceans, ii. 105, 198 ; and sedimen- 

 tation, ii. 228 ; and volcanic action, 

 ii. 144 



Subterranean animal, existence in Pata- 

 gonia of supposed, ii. 361 



Subularia, fertilisation of, i. 416 : ii. 



255 

 Succession of types, i. 132, 133 

 Sudden appearance of organisms, due 



to absence of fossils in pre-Cambrian 



rocks, i. 398 

 Sudden jumps, modification by, i. 147, 



166 ; Darwin's disbelief in, i. 335 

 Suess, i, 244 ; Antlitz der Erde, ii. 167 

 Suffolk Crag, comparison with recent 



strata, ii. 233 

 Sugar-cane, Barber on hybrids of, 



i. 389 ; new varieties of, i. 390 

 Sulivan, Admiral, on Patagonia, ii.234 

 ■Superficial deposits, geological nature 



of, ii. 168 

 Supernumerary members, i. 251 ; am- 

 putation followed by regeneration of, 



i-363 

 " Survival of the fittest," Darwin on 



use of the expression, i. 270, 271 ; 



Wallace on the expression, i. 268, 



269 ; sharpness of thorns the result of, 



i. 308 ; colour of birds and, ii. 62 

 Swainson, i. 305 ; on wide range of 



genera, i. 403 

 Switzerland, Tyndall on valleys of, 



ii. 191 

 Sydney, i. 27 

 Symonds, W. S., biographical note, 



i. 1 70 ; on imperfection of geological 



record, i. 170 



Tacsoxia, Darwin on flowers of, ii. 



380 ; fertilisation by humming-birds, 



"• 357> 3S3 ' Scott's work on, ii. 311 

 Tahiti, coral reefs of, ii. 141, 196 ; 



Darwin on, ii. 155, 225, 227 

 Tails of diluvium, in Scotland, ii. 149 

 Tait, Prof. P. G., article in North 



British Review, i. 316 ; on age of 



world, ii. 212 

 Tait, L., letters to, i. 358, 359, 363 



