1789 AND LATER 391 



support of their own conviction that no science concerns 

 mankind so deeply as that, which since 1789 and 

 especially since 1859 has thrown a flood of new light 

 upon the infinitely varied forms and activities of Life. 



There is perhaps no more hopeful augury of the future 

 of Biology than the increased and ever-increasing sobriety 

 of biological speculation. Bold hypotheses are no doubt 

 framed as profusely as ever, but the speculator is made 

 to feel that he must not set them forth in print until he 

 can support them adequately. 



