EVOLUTION AS A NATURAL PROCESS 149 



not so well substantiated as the ones we have reviewed 

 at greater length. 



The task of experimental zoology is to work more 

 extensively and deeply upon inheritance and variation, 

 combining the methods and results of cellular biology, 

 biometrics, and experimental breeding. We may safely 

 predict that great advances will be made during the 

 next few years in analyzing the method of evolution ; 

 and that a few decades hence men will look back to 

 the present time as a period of transition like the 

 era of reawakened interest and renewed investigation 

 that followed the appearance of the " Origin of Species." 

 For the present, we can justly say that evolution, so 

 far as it is understood, is a real and natural process. 



