CONTENTS 



CHAPTER I 



PAGE 



THE PROBLEM i 



CHAPTER II 

 HISTORICAL 7 



CHAPTER III 

 MENDEL'S WORK . . . . . . -15 



CHAPTER IV 



THE PRESENCE AND ABSENCE THEORY ... 26 



CHAPTER V 



INTERACTION OF FACTORS 39 



CHAPTER VI 



REVERSION 54 



CHAPTER VII 

 DOMINANCE ........ 63 



