x CONTENTS 



b. The Evidence from Interference. .137-138 



c. The Evidence from Non-Dis- 



junction 139-142 



5. How MANY GENETIC FACTORS ARE THERE IN 



THE GERM-PLASM OF A SINGLE INDI- 

 VIDUAL? 142-143 



6. CONCLUSIONS 144 



CHAPTER IV 

 SELECTION AND EVOLUTION 



1. THE THEORY OF NATURAL SELECTION 145-161 



2. How HAS SELECTION IN DOMESTICATED ANI- 



MALS AND PLANTS BROUGHT ABOUT ITS 

 RESULTS? 161-165 



3. ARE FACTORS CHANGED THROUGH SELECTION? 165-187 



4. How DOES NATURAL SELECTION INFLUENCE 



THE COURSE OF EVOLUTION? 187-193 



5. CONCLUSIONS 193-194 



INDEX . ..195-197 



