A STUDY OF THE SKIN AND THE KIDNEYS 237 



and the depression would answer to the hair fol'li-cle or pit, 

 from which projects in a diagonal direction the shaft of the 

 hair (represented by the pin). The root of the hair is there- 

 fore a considerable distance from the surface of the skin; 

 indeed, it is usually deep down in the fatty layer. 



Oblique section.throngh 

 Papilla of hair a Pacinian corpuscle 



FIG. 111. Vertical Section of Scalp, highly magnified. 



At the base of every hair is a cup-shaped depression into 

 which projects a third kind of papilla of the dermis. TJiis 

 is supplied with both blood vessels and nerves. All the 

 growth of the hair takes place in the cells just above this 

 papilla, that is, in the lower cells of the epidermis. The 

 projecting shaft is wholly formed of dead horny cells. 



Hairs usually pass up through the dermis and epidermis 

 in a diagonal direction. From the base of the hair follicle, 

 on the side toward which, the hair slopes, minute bundles of 



