LECTURE IV. 



I 



THE ORIGIN AND ANTIQUITY OF MAN. 



MAN, when regarded merely as an organ- 

 ism, is closely related to the lower an- 

 imals. His body is constructed on the same 

 general plan with theirs. More especially, he 

 is near akin to the other members of the class 

 Mammalia. But we must not forget that even 

 as an animal man is somewhat widely separated 

 from his humbler relations (see Fig. 7). It is 

 easy to say that every bone, every muscle, every 

 convolution of his brain, has its counterpart in 

 the corresponding parts of an orang or a go- 

 rilla. But, admitting this, it is also true that 

 every one of these parts is different, and that 

 the aggregate of all the differences mounts up 

 to an enormous sum-total, more especially in 

 relation to habits and to capacities for ac- 

 tion. Those remarkable homologies or like- 

 nesses of plan which obtain in the animal king- 

 dom are very wonderful, and the study of them 

 greatly enlarges our conceptions of the unity 



1X0 



V 



