CONTROL OF HEREDITY: EUGENICS 407 



ously present. Nowhere in the entire process 

 of organic evolution is there any evidence that 

 new factors are "extrinsic additions" or are cre- 

 ated de novo. The whole process is one of evo- 

 lution, that is of new combinations of existing 

 units, having new qualities which are the results 

 of these new combinations. 



If these changes in the germ plasm may be 

 induced by extrinsic conditions, then a real 

 experimental evolution will be possible ; if they 

 cannot be so induced but are like the changes 

 taking place in the radium atom we can only 

 look on while the evolutionary processes pro- 

 ceed, selecting here and there a product which 

 nature gives us but unable to initiate or con- 

 trol these processes. 



B. CONTROL OF HUMAN HEREDITY: 

 EUGENICS 



I. Past Evolution of Man 



There is every evidence that man also, no 

 less than domesticated animals, has evolved 

 from a natural or wild state. The most primi- 

 tive types of men are known only from a few 



