246 



Science of Life. 



Psychology of Animals, 198. 



Ray, 13. 



Recapitulation doctrine, 133. 

 Redi's Experiments, 95. 

 Renascence, the Scientific, 2. 

 Reproduction in Animals, Physio- 

 logy of, 67. 

 in Plants, 78. 

 Romanes, 205. 



Sachs, Julius von, 74. 

 Saussure, Theodore de, 72. 

 Schleiden, Matthias Jacob, 45. 

 Schwann and Schleiden, 62. 

 Scientific Renaissance, 215. 

 Scott, W. B., 174. 

 Secret of Nature, 192. 

 Secretions, the study of internal, 60. 

 Sex and Reproduction, experiments 



on, 8 1. 



Sexuality of Cryptogams, 80. 

 Simroth, 183. 



Skull, Vertebral theory of, 35. 

 Smith, William, 165. 

 Species, conception of, 18. 

 Spencer, 144, 197. 

 Spermatozoon, nature of, 125. 

 Spontaneous Generation, 94. 



Sprengel, Christian Konrad, 79, 191. 

 Struggle for existence, 195. 



Terrestrial Fauna, 183. 

 Treviranus, 222. 

 Tyndall, 98. 



Variation, discontinuity in, 232; 



theories of, 229; statistical study 



of, 234. 

 Variation, Materials for the Study 



of, 231. 

 Vines, 43. 

 Virchow, 158. 



Virchow's Cellular Pathology, 66. 

 Vital Force, 86. 

 Von Baer, Karl Ernst, 122-3. 

 Von Baer's Laws, 134. 



Wallace, A. R., 176. 

 Ward, Marshall, 50. 

 Weismann, 9, 10, 89, 149, 156, 206. 



229. 



Wilson, E. B., 36, 37, 130. 

 Wohler, 58. 

 Wolff, Caspar Friedrich, 42. 



Zittel, Karl Alfred von, 169, 172. 

 Zoo-geographical Regions, 175. 



