64 WHAT EVOLUTION IS 



hypothesis, Eimer's orthogenesis, De 

 Vries's mutation theory and the Hke. 

 In so brief a survey as this volume 

 offers it will be profitable to consider 

 only the more noteworthy of these 

 views and in conformity with this plan 

 the next chapter will contain brief 

 critical accounts of Lamarck's hypoth- 

 esis, of Darwinism or the theory of 

 natural selection, and of the mutation 

 theory of De Vries. 



