190 Life and Health 



in a sort of ball about one-sixtieth of an inch in diameter. 

 From this coil the tube passes upward through the dermis 

 in a wavy course until it reaches the cuticle, which it pene- 

 trates with a number of spiral turns, at last opening on the 

 surface. 



The tubes have delicate walls lined with epithelial cells. 

 The coil of the gland is enveloped by minute blood vessels. 



FIG. 99. Cross-Section of a Human Hair with its Follicle. 

 (Magnified about 300 diameters.) 



The cells of the glands are separated from the blood only 

 by a fine partition and draw from it whatever supplies they 

 need for their special work. 



^ 288. Number of Sweat Glands. With few exceptions 

 every portion of the skin is provided with sweat glands, 

 but they are not equally distributed over the body. They 



