284 THE ORIGIN AND EVOLUTION OF LIFE 



many rare and unusual results. The passage from 

 the miracles of nature to those of art is easy ; for if 

 nature he once seized in her variations, and the cause 

 he manifest, it will he easy to lead her hy art to such 

 deviation as she was at frst led to hy chance; and 

 not only to that hut others, since deviations on the 

 one side lead and open the way to others in every 

 direction.' ' 



