280 LECTURE VI. 



But I forbear to say more ; for I have not 

 received the appointment of professor of 

 moral philosophy to the college. Yet it is 

 a part of my duty to place before you, Gen- 

 tlemen, a specimen of what I believe to be 

 the ancient Greek philosophy of life, and a 

 sample of some modern French physiology 

 on the same subject, for your consideration 

 and choice. 



- Now though I have forborne to consider 

 the structure of the organs of sense in ge- 

 neral, I wish to say a few words on that of 

 the human skin, which is capable, in all its 

 parts, of distinguishing what are called the 

 tangible properties of substances, because 

 the skin forms the surface of the body, and 

 there is probably an analogy in the cover- 

 ings of all kinds of animals. Had the skin 

 been exposed to the air, it would have either 

 become dry and horny from evaporation, 

 as we see in the dead subject when the 

 cuticle is removed, or encrusted, from the 

 same cause, by the residue of the fluids it 



