X CONTENTS 



CHAPTER FAOS 



14. The Theory of Reversion 220 



15. Some New Principles of Breedinq based on 



Mendel's Theory 233 



16. The Inheritance of Sex 247 



17. The Origin of the Mendelian Mode of Inheritance 267 

 Glossary ........ 275 



Index .,.,...#. 277 



Colour Plates 



PLATE FACING FAG» 



I. MENDELIAN INHERITANCE OP THE COLOUE OF THE SEED IN 



THE culinary PEA . . . , . . .58 



IX. MENDELIAN INHERITANCE IN MICE 74 



III. THE RESULT OF CROSSING A YELLOW WRINKLED WITH A 



GREEN ROUND PEA . . . , . . .94 



IV. MENDELIAN INHERITANCE OF TJ^B COLOUR OF THE FLOWER 



IN THE CULINARY PEA . e 118 



