154 Evolution of Animal Life. 



As I have said, the laws of lieredity and variation are 

 little known. It is in this direction, doubtless, that further 

 light may be expected. But there is already light enough 

 to permit ns to see that the jn'oduetion of specific animal 

 forms by derivation, and not by independent origin, is the 

 only rational theory we can entertain ; that the Darwinian 

 hypothesis, as now reinforced and complemented, is more 

 satisfactory than ever as an exjilanation of the mode of such 

 derivation ; and that, thus exi)lained, the succession of life 

 upon the globe falls into its place as a harmonious element 

 in what I, for one, conceive to be the vast, complex, yet or- 

 derly and rational expression of an immanent, self-revealing 

 God. 



