CONTENTS 



CHAPTER I 



THEORIES OP HEREDITY 



Definition of Heredity The multiplication of cells The Germ- 

 plasm The characters of living beings Inborn characters Ac- 

 quired characters Modifications Variations The Lamarckian 

 doctrine of Heredity ... 1 



CHAPTER II 



THEORIES OF EVOLUTION 



The Bathmic Theory The Lamarckian TheoryThe Neo- 

 Darwinian Theory The alleged inheritance of acquired characters 

 Mutilations Maternal impressions Diseases .... 13 



CHAPTER III 



USE AND DISUSE 



Regeneration Adaptive acquirements The co-ordination of 

 animal parts The effects of use and disuse The evolution of the 

 power of making adaptive acquirements 29 



CHAPTER IV 



SPONTANEOUS VARIATIONS 



Variations attributed to the direct action of the environment 

 Some variations at least arise otherwise The evidence that varia- 

 tions are caused by external influences Reasons for believing they 

 are not so caused Variations said to be caused by bi-parental 

 reproduction The principal forms of bi-parental inheritance 

 Evidence that bi-parental reproduction is a cause of variations . 38 



CHAPTER V 



RECAPITULATION 



The recapitulation of the parental development The con- 

 sequent recapitulation of the life-history of the race Neglect of 

 the doctrine of recapitulation by students of heredity Regressive 

 and progressive variations Reversion the same thing as regression 

 Dormant traits Reversed Selection . 52 



