lis 



THE GEXESIS OF SPECIES. 



[Chap. 



woiulerfully folded teeth of the liibyrinthodoiits. The 

 luarvellously complex structure of these organs is not 

 merely unaccountable as due to " Natural Selection," but 

 its production by insignificant increments of complexity 

 is hardly less diflicult to comprehend. 







Xt'CU KXLAKUKI> HOKIZOXTAL SECTION OF THE TOOTH OF A LABYRINTHODON. 



Siniihuly the aborted index of the Potto {Pcroclicticus) 

 is a structure not likely to have been induced by minute 

 changes ; while, as to " Natural Selection," the reduction of 

 the forefinger to a mere rudiment is inexplicable indeed ! 

 " How this mutilation can have aided in tlie struggle for 

 life, we must confess, batHes our conjectures on the sub- 



