CONTENTS 



CHAPTER I 



INTRODUCTION .... I 



CHAPTER II 



THE SCIENTIFIC STUDY OF VARIATION AND HEREDITY . 14. 



CHAPTER III 



INHERITANCE AND VARIATION IN MANKIND . . -35 



CHAPTER IV 



THE INHERITANCE OF MENTAL DEFECT . . .61 



CHAPTER V 



THE INHERITANCE OF ABILITY . . . -73 



CHAPTER VI 

 THE RISE OF FAMILIES . . . . .92 



CHAPTER VII 



THE DECLINE OF FAMILIES . . . . .109 



