THE EPIDERMIS. 



153 



all directions, somewhat like felt, hence the strength and 

 durability of leather, which is the dennis preserved and pre- 

 pared in various ways. The epidermis is usually removed in 

 tanning. 



The outer surface of the dennis has numerous conical ele- 

 vations, Papillae, which fit into corresponding depressions in 



Mouth of Sweat Duct 



Papilla 



"~ Dermis 



v 



Vein Artery 



Fig. 51. Section of Epidermis, Showing Papilla. (Highly Magnified.) 



the epidermis. In the palm of the hand, etc., the ridges of 

 the epidermis correspond to the rows of papillae of the dermis 

 underneath. But over most of the dermis the papillae are 

 irregularly placed, and there are no corresponding elevations 

 of the epidermis. 



