328 PHYSICAL EXPRESSION. 



required only labour and a steady hand. The 

 subject was permanent ; the Anatomist could fix it 

 in any position, and make what experiments on 

 it he pleased. 



" The Human Mind, on the other hand, is an 

 object extremely fleeting, not the same in any two 

 individuals, and ever varying even in the same 

 person. To trace it through its almost endless 

 varieties, requires the most profound and extensive 

 knowledge, and the most piercing and collected 

 genius. But tho' it be a matter of great diffi- 

 culty to investigate and ascertain the laws of the 

 mental constitution, yet there is no reason to 

 doubt, however fluctuating as it may seem, of its 

 being governed by laws as fixt and invariable as 

 those of the Material System. It has been the 

 misfortune of most of those who have study'd the 

 philosophy of the Human Mind, that they have 

 been little acquainted with the structure of the 

 Human Body, and with the laws of the Animal 

 (Economy; and yet the Mind and Body are so 

 intimately connected, and have such a mutual in- 

 fluence on one another, that the constitution of 

 either, examined apart, can never be thoroughly 

 understood. For the same reason it has been an 

 unspeakable loss to Physicians, that they have been 

 so generally inattentive to the peculiar laws of the 

 Mind, and to their influence on the Body. 



"A late celebrated professor of Medicine in a 

 neighbouring nation, who, perhaps, had rather a 

 clear and methodical head, than an extensive genius 

 or enlarged views of Nature, wrote a System of 



