_Revue Générale de Botanie_, referred to, 126. RICHARDSON, referred to, 188. ROUX, Prof., referred to, 298. Rudiments, 294. RYDER, Prof., referred to, 14. S. SACHS, Prof., referred to, 15, 174. "Sally," counting of, 31. SAUERMANN, Dr., referred to, 218. SCHÄFER, Prof., referred to, 145. _Schmetterlinge des Südwestlichen Deutschlands_, referred to, 217. SCHMIDT, Dr. Oscar, quoted, 260. Schools of Evolutionists, 12-20. SCOTT, Prof., referred to, 63. Scratching, reflex, in dogs, 80; in rats, 81. Seasonal changes of butterflies, 210. SEEBOHM, Mr. Henry, quoted, 173; referred to, 174. Selection, cessation of, 99, 292; reversal of, 101, 292. Selection, sexual, 219 _et seq._ Selective value, 73. Self-adaptation, 18. SEMPER, Prof. Karl, referred to, 101. Sexual selection, 219 _et seq._ Sole, pigment of, 104. Somatogenetic and somatoplasm, 123, 137, 155, 242-249. _Some Laws of Heredity_, referred to, 24. Species, stress laid on origin of, 159; necessarily due to natural selection, 168. ---- definitions of, 229. SPENCER, Herbert, referred to, 8, 64-68, 95. Sphex, instincts of, 88, 337. STEBBING, Rev. T. R., quoted, 25. Sterility, 8. Stirp and germ-plasm, 40, 47, 138. _Struggle for Existence between the parts of an Organism_, referred to, 299. T. Theory of Heredity, referred to, 40, 47, 137, 154; quoted, 46, 47. THOMAS, Mr. Oldfield, referred to, 178. THOMSON, J. A., referred to, 15. TODD, J. E., referred to, 35. TOMES, Mr., referred to, 267. Transfusion of blood in rabbits, 145. Transplantation of ovaries in rabbits, 143, 147. Trees, comparison of European and American, 201. Turkey, tuft of hair of, 181; losing metallic tints, 186. U. Use-inheritance, 3, 49, 77, 95, 151. Utility, law of, 8, 20, 159; universality of, 166; of specific characters, 172; of specific characters in birds, 176; of specific characters in Mammals, 178. V. _Variation of Animals and Plants under Domestication_, quoted, 3, 4, 53, 66, 96, 187, 189, 191, 193, 195, 213-216, 330, 331. Varieties, climatic, 228. Vestigial characters, 171, 184, 261, 294. VINES, Prof., referred to, 297. Vitality, plumes of birds due to surplus, 270, 25. Voice, of man, 25. W. WAGNER, Moritz, referred to, 217. WALLACE, Mr. A. R., referred to, 2, 6, 9, 11, 15, 20-35, 50, 66-70, 167, 169, 172-175, 180-198, 210, 218-227, 235-237, 252, 256, 258, 263-278, 285, 313-322, 328, 331, 332; quoted, 22-24, 27, 67, 180-182, 185, 186, 190, 191, 221-223, 235, 236, 269, 273, 313. Wallacean doctrine of species, 167, 169. WEISMANN, Prof., referred to, 2, 7, 9, 12, 13, 39-60, 65, 66, 90-105, 112, 128, 134-142, 148, 149, 151, 152, 155, 156, 173, 241, 243, 244, 246, 279, 280, 291, 294, 297, 298, 300, 311, 338; quoted, 56, 91, 97, 152, 243, 244, 297. Weismannism, diagram of constituent theories, 43, 136; elusiveness of, 334. _Weismannism once more_, referred to, 66, 95. WELBY, Hon. Lady, referred to, 90. WESTPHAL, Prof., referred to, 105, 107.