112 WHAT EVOLUTION IS 



those with favorable inborn traits 

 would be preserved and have off- 

 spring as contrasted with those whose 

 conditions were less favorable. Thus 

 Lamarckism deals with difference in- 

 duced by the environment, acquired 

 characters, and Darwinism with in- 

 born native differences. 



Before leaving this comparison of 

 the two views it should be pointed out 

 that they are in no sense mutually ex- 

 clusive. It is sometimes implied that 

 if Darwinism could be shown to be 

 true Lamarckism must be false and 

 vice versa. It must be evident, how- 

 ever, that such is not the case. There 

 is not the least reason to assume that 

 one view is in any way incompatible 

 with the other. It is entirely possible 

 that both Lamarckism and Darwin- 

 ism may be acting at once and in per- 

 fect accord as mutually efficient 

 factors in evolution. 



