X CONTEXTS 



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? lia-l-iS 



6. Conclusions l-ii 



CHAPTER IV 



SELECTION AND EVOLUTION 



1. The Theory of Natural Selection 145-161 



2. Hove 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 op Evolution? 187-193 



5. Conclusions 193-194 



Index 195-197 



