CHAPTER V 



CONTROL OF HEREDITY: EUGENICS 



It is the aim of science to interpret phe- 

 nomena and as far as possible to control 

 them. To what extent is it possible to control 

 heredity and thus to improve the race, as well 

 as the individual? 



A. DOMESTIC ANIMALS AND CULTIVATED 

 PLANTS 



The history of domesticated animals and 

 cultivated plants shows that it is possible to 

 control or rather guide phenomena of he- 

 redity and evolution. Very many species of 

 wild animals have been tamed by man but 

 only about 40 species may be classed as 

 domesticated. In a number of instances the 

 wild stocks from which these domestic forms 

 came are known and it is possible to compare 

 them with their modified descendants and thus 



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