I.] INTRODUCTORY. 25 



That there are many remarkable plienomena in organic 

 forms upon which "Natural Selection" throws no light 

 whatever, but the explanations of which, if they could be 

 attained, miglit throw light upon specific origination. 



Besides these objections to the sufficiency of "Natural 

 Selection, " others may be brought against the hypothesis 

 of "Pangenesis," which, professing as it does to explain 

 great difficuUies, seems to do so by presenting others 

 not less great — in fact almost to be the explanation of 

 ohicurum per obscwrim. 



