CHAPTEE XIV 

 HUMAN HAIR 



A SINGLE human hair is by no means an 

 -*--*- elementary structure. It is surprising 

 what an amount of physiological detail it 

 contains. There seems to be as much care 

 and skill expended upon it and all its parts, 

 and they are many, as upon a limb or any of 

 the great vital organs of the body. 



In its immediate composition there are nine 

 or ten different layers in addition to its muscles, 

 glands, and blood vessels. If added to all this 

 we were to look at a single hair histologically, 

 and see the various cells as they are arranged 

 in cuticle, shaft, Huxley's layer, Henle's layer, 

 and cortex of root, we should be inclined to 

 think we were examining a much larger and 



