THE SKIN. 



71 



idly, so that no moisture is noticeable upon the surface ; and we call 

 this the insensible perspiration. 



FIG. 16. 



Clauds 



Nutrient Artery 



Sectional View of the Skin, magnified. 



What is the sweat ? 



It is a watery fluid, colorless, slightly turbid, slightly salty to the 

 taste, of acid reaction, and possessing a peculiar odor. It is an 

 excrement. Its composition is somewhat variable, but in general it 



