Index 
Ruskin, 482 
Rutherford, E., 570-576, 581 
Rutot, 130 
Sachs, J., 1114, 210, 223 
St Hilaire, E. G. de, 8, 13, 16 
Salamandra atra, 269 
S. maculosa, 269 
Saltatory Evolution, 22-25 (see also Muta- 
tions) 
Sanders, experiments on Vanessa by, 50 
Saporta, on the Evolution of Angiosperms, 
313, 316 
Sargant, Ethel, on the Evolution of Angio- 
sperms, 208? 
Savigny, 531, 532 
Scardafella inca, 280, 281 
Scent, in relation to Sexual Selection, 296 
Scharff, R. F., 3024 
Schelling, 5, 6, 448, 449 
Schlegel, 515 
Schleicher, A., on language, 526-528 
Schleiden and Schwann, Cell-theory of, 
137 
Schmarda, L. K., on geographical distri- 
bution, 321 
Schoetensack, on Homo heidelbergensis, 
1291 
Schreiner, K. E., 110? 
Schiibler, on cereals, 243 
Schultze, O., experiments on Frogs, 262 
Schur, 560 
Schiitt, 26, 26 
Scuwatpe, G., on The Descent of Man, 
112-136 
Sclater, P. L., on geographical distri- 
bution, 321-324, 327 
Scort, D. H., on The Palaeontological 
Record (Plants), 200-222 
— 189? 
Scorr, W. B., on The Palaeontological 
Record (Animals), 185-199 
Scrope, 357, 373 
Scyllaea, 279 
Sechehaye, C. A., 5161 
Szpewicr, A., on The Influence of Darwin 
on Animal Embryology, 171-184 
Sedgwick, A., Darwin’s Geological Expedi- 
tion with, 343, 344 
Seeck, O., 5361 
Seed-plants, origin of, 209-213 
Segregation, 92, 93 
Selection, artificial, 19, 20, 32, 35, 67, 118, 
469-471 
— germinal, 27, 28, 36-40, 49 
593 
Selection, natural (see Natural Selection) 
— organic, 41, 428, 429 
— sexual, 43-49, 116, 117, 277, 292-297, 
417 
— social and natural, 470 
— 18-65, 96, 125, 126 
Selenka, 127 
Semnopithecus, 127 
Semon, R., 22, 142 
Semper, 368 
Senebier, 223 
Senecio vulgaris, 421 
Sergi, 131, 135 
Seward, A. C., 1, 713, 312, 314, 317 
— and 8. O, Ford, 212! 
— and J. Gowan, 201? 
Sex, recent investigations on, 93, 94 
Sharpe, D., 373 
Sherrington, C. 8., 523 
Shirreff, P., 80, 82 
Shrewsbury, Darwin’s recollections of, 340, 
341 
Sibbern, 449 
Sinapis alba, 415 
Smerinthus ocellata, 29 
S. populi, 29 
S. tiliae, 29 
Smith, A., 448 
Smith, W., 185 
Snyder, 256 
Sociology, Darwinism and, 465-476 
— History and, 535 
Soddy, 573 
Sollas, W. J., 128, 129, 369 
Sorley, W. R., 461 
Species, Darwin’s early work on trans- 
mutation of, 350-353 
— geographical distribution and origin of, 
322, 323 
— immutability of, 323 
— influence of environment on, 240-246 
— Lamarck on, 244 
— multiple origin of, 323, 324 
— the nature of a, 226, 227 
— polymorphic, 69, 70 
— production by physico-chemical means 
of, 270 
— and varieties, 69, 94, 95 
— de Vries’s work on, 241, 242 
Spencer, H., on evolution, 451-456 
— on Lyell’s Principles, 338 
— on the nature of the living cell, 227 
— on primitive man, 501 
— on the theory of Selection,’ 32 
— on Sociology, 468 
