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'' s Progress in Science. 



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