52 PRIMEVAL MAN. 



belong to the science of Physiology. Nature 

 is her own interpreter, and her evidence is 

 clear. Whatever may be the anatomical 

 difference between Man and the Gorilla, that 

 difference is the equivalent, in physical orga- 

 nization, of the whole mental difference between 

 a Gorilla and a Man. This is the measure 

 of value which Nature has set upon the kind 

 and degree of divergence which separates these 

 two Material Forms. Any other measure of 

 value which may be set on that divergence 

 must be founded on an arbitrary and partial 

 selection among the facts of which all sound 

 classification must take account. Imperfect 

 as all existing systems of classification are, 

 they are not so bad in the case of any group 

 of the lower animals as to separate organs 



