BY-PATHS OF BIOLOGY. 303 



we might expect ; for however great may have been the 

 intellectual triumphs of the nineteenth century, we can 

 hardly think so highly of its achievements as to imagine 

 that, in somewhat less than twenty years, we have passed 

 from complete ignorance to almost perfect knowledge on 

 two such vast and complex subjects as the Origin of 

 Species and the Antiquity of Man. 



