122 THE SPEECH OF MONKEYS. 



the same as the light sulky is the outgrowth 

 of the massive framework of the old-time cart. 

 Whether man and ape are related by any ties of 

 blood or not, it is evident that they were mod- 

 elled on the same plan, provided with the same 

 means, and designed for like purposes, whatever 

 they may be. The organs of sensation and the 

 functions which they discharge are the same in 

 both, and the same external forces addressing 

 themselves thereto produce the same results. I 

 do not mean to say that the same organ in each 

 is developed in the same degree as that in the 

 other ; for this is not the case even in different 

 individuals of the same kind. In the muscular 

 system of the one is found an exact duplicate of 

 the other, except in such slight changes of model 

 as will better adapt the parts to those conditions 

 of life under which the animal having them may 

 be placed, and through the whole physical 

 structure of both we find that unity of part and 

 purpose in structure and function, in bone, mus- 

 cle, nerve, and brain. It has been shown, beyond 

 a reasonable doubt, that the brain in the higher 

 races of mankind has reached its present form 

 through a series of changes which are constant 

 and definite, and this organ in the lower types 



