i.] DARWINISM VERIFIED. 31 



toed mammal, as thus demonstrated, supplies all that 

 was required to complete the proof of the Darwinian 

 theory. The theory not only alleges a vera causa 

 and is not only confirmed by the unanimous import 

 of the facts of classification, embryology, morphology, 

 distribution, and succession ; but it has further suc- 

 ceeded in tracing the actual origination of one generic 

 type from another, through gradual " descent with 

 modifications." And thus, within a score of years 

 from its first announcement, the daring hypothesis 

 of Mr. Darwin may fairly claim to be regarded as 

 one of the established truths of science. 



December, 1876. 



