PAGS 



CONTENTS 



CHAPTER I. 



Introductory: The Darwinism of Darwin and of the 



Post-Darwinian Schools i 



CHAPTER II. 

 Characters as Hereditary and Acquired {Preliminary) 39 



CHAPTER III. 



Characters as Hereditary and Acquired {Continued'). 



A. Indirect evidence in favour of the Inheritance of Ac- 



quired Characters . . .... 60 



B. Inherited effects of Use and of Disuse - ... 95 



CHAPTER IV. 



Characters as Hereditary and Acquired {Continued). 



C. Exferimental evidence in favour of the Inheritance of 



Acquired Characters 103 



CHAPTER V. 



Characters as Hereditary and Acquired {Continued). 

 A. and B. Direct and Indirect Evidence in favour of the 



Non-inheritance of Acquired Characters . . .133 

 C. Experimental Evidence as to the Non-inheritance of 



Acquired Characters I^a 



