AND PHYSIOLOGY. SOI 

 Fig. 292. Fig. 293. 



Skin of the Palm showing Ridges, Fur- 

 rows, Cross Groves, and. Pores, or Orifices 

 of Sweat Ducts. 



tube 145,853 feet, or 48,611 

 yards, or nearly 28 miles. 

 Dalton says, 153,000 inches 

 or two and a half miles. 



526. The Perspiration. 

 — Sensible and Insensible 

 Perspiration. — The secre- 

 tion poured out by these 

 glands, is a transparent liquid 

 of an acid reaction, and of a 

 saltish taste, commonly known 

 as sweat or perspiration. This 

 is produced in two forms, 

 known as sensible and insen- 

 sible perspiration, which is 

 escaping from the body in 

 one of these forms constantly during health, the sensible being 

 given off whenever excretion is so great as to leave moisture 

 upon the skin. 



526. Describe the perspiration. What two forms of it ? 



Vertical Section of the Sole of the Foot. 

 a. Epidermis. 5. Papillary Structure. 

 c. Cutis, d. Sweat Gland magnified forty 

 diameters. 



