LITTLE STUDIES IN DIFFERENTIATION. 



** The point of the comparative method is that it brings before us a 

 great number of objects so nearly alike that we are bound to assume for 

 them an origin and general history in common, while at the same time 

 they present such differences in detail as to suggest that some have 

 advanced further than others in the direction in which all are travelling ; 

 some, again, have been abruptly arrested, others perhaps even turned 

 aside from the path. In the attempt to classify such phenomena the 

 conception of development is presented to the student with irresistible 

 force." 



JOHN FISKE, A Century' 1 s Progress in Science. 



