(THE GLANDS. 69 



the secreting part of which is coiled up into a ball about -$ 

 or T ^j- inch in diameter, imbedded in the subcutaneous 

 tissue, and supplied freely with blood-vessels, while the duct 

 passes vertically up through the corium. Sometimes there 

 are two tubes in one coil ; uniting to form one duct. In the 



Fig. 38. SWEAT GLANDS AND PACTNIAN CORPUSCLES, a, Papillary 

 surface of corium ; b, secreting portions of the sweat glands ; c, 

 corpuscles of Pacini. _ w 



palm of the hand and the sole of the foot, where the epider- 

 mis is thick, the sudoriparous ducts, in passing through the 

 horny layer, are thrown into a fine spiral like a cork-screw, 

 which may be accounted for thus: the ducts in the deep 

 part of the cuticle are lined with horny epithelium, which is 

 incapable of contraction, while round about them are grow- 

 ing epithelial cells of the rete mucosum, which, as they 



