xxvi CONTENTS 



PAGE 



Adaptation to environment 253 



Geographic distribution 259 



Changes of proportion 263 



Retrospect and prospect 275 



Conclusion . . . 281 



APPENDIX 



NOTE 



I. Different modes of storage and release of energy in 



living organisms 285 



II. Blue-green alg^ possibly among the first settlers of 



OUR PLANET 285 



III. One secret of life — synthetic transformation of in- 



different MATERIAL 286 



IV. Interaction through catalysis — the acceleration of 



CHEMICAL REACTIONS THROUGH THE PRESENCE OF ANOTHER 

 SUBSTANCE WHICH IS NOT CONSUMED BY THE REACTION . 286 



V. The causes or agents of speed and order in the reac- 

 tions OF LIVING BODIES — ENZYMES, COLLOIDS, ETC. . . 287 



VI. Interactions of the organs of internal secretion and 



HEREDITY 289 



VII. Table — relations of the principal groups of animals 



referred to in the text 29o 



Bibliography 293 



Index 307 



