160 man: his genetic relations. 



ally led to infer a process of ascensive development, 

 by wliicli the higher spring from the lower, and the 

 highest from those that stand next beneath them. 

 And finally, that in this way, and under the opera- 

 tion of physical forces, and in conformity with a great 

 aboriginal plan, a genetic connection is established 

 between the whole animal scheme, and an origin 

 assigned to man, the nature of which may be traced 

 and submitted to the ordinary rules of scientific in- 

 vestigation. 



