CONTENTS 



CHAPTER I 

 THE PROBLEM 



CHAPTER II 

 HISTORICAL ... .... 



CHAPTER III 

 MENDEL'S WORK 



CHAPTER IV. 

 THE PRESENCE AND ABSENCE THEORY 



CHAPTER V 

 INTERACTION OF FACTORS 



CHAPTER VI 

 REVERSION * * 59 



DOMINANCE . 



CHAPTER VII 



68 



