CONTENTS 



CHAPTER I 



PAGE 



Introductory Remarks . . . . . i 



CHAPTER II 



The Specific Difference between Living and 

 Dead Matter and the Question of the 

 Origin of Life 14 



CHAPTER III 



The Chemical Basis of Genus and Species: 40 



I. — The Incompatibility of Species not 



Closely Related ..... 44 



II. — The Chemical Basis of Genus and Species 



and of Species Specificity ... 53 



CHAPTER IV 



Specificity in Fertilization . . . ". 71 



CHAPTER V, 



Artificla^l Parthenogenesis . , ' . -95 



CHAPTER VI 



Determinism in the Formation of an Organism 



from an Egg 128 



ix 



