338 NATURE STUDY AND AGRICULTURE 



and not necessarily by the slow process of building up 

 small variations generation after generation by natural 

 selection. Of course, natural selection will determine 

 which of the species thus produced will survive. 



The mutation theory is so new that it is impossible to 

 say at present whether it has any general application, or is 

 only a very occasional method. Whatever may be its fate, 

 the epoch it introduced is the epoch of the experimental 

 study of evolution, which must be the final resort in solving 

 such a problem. 



