CONTENTS 



CHAPTER I 



THEORIES OF HEREDITY 



AGE 



Definition of Heredity The multiplication of cells The Germ- 

 plasm The characters of living beings Inborn characters Ac- 

 quired characters Modi fications Variations The Lamarckian 

 doctrine of Heredity 1 



CHAPTER II 



THEORIES OF EVOLUTION 



The Bathmic Theory The Lamarckian Theory The 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 



