THEORIES OF ORGANIC EVOLUTION 



Meantime, through the efforts of chemists and biolo- 

 gists, the gap between the inorganic and the organic 

 worlds, which once seemed almost infinite, has been 

 constantly narrowed. Already philosophy can throw 

 a bridge across that gap. But inductive science, 

 which builds its own bridges, has not yet spanned the 

 chasm, small though it appear. Until it shall have 

 done so, the bridge of organic evolution is not quite 

 complete; yet even as it stands to-day it is perhaps 

 the most stupendous scientific structure of the nine- 

 teenth century. 



