PHYSIOLOGY AND ANATOMY. 29 
root of each hair, and the difference between the moistness 
in the hair of different persons depends on the amount of 
liquid that the follicle secretes. 
Ad 
. The third division of secretory {organs is, called glands. 
These are situated in different parts of the body, and are of 
various sizes—some being quite small, 'others ,quite large, 
weighing several pounds—and contain arteries and veins to 
earry the blood to them and return it again. The substance: 
which the glands secrete differ very much in appearance from 
_ the blood, although they are formed from it.% The saliva is. 
formed by three pairs of glands, situated in the mouth. 
: THE GLANDS. 
‘The gastric juice is a fluid that is secreted in the stomach, 
and very much resembles the saliva; yet it is more powerful 
in its operations, and of more importance to us in its use. 
During the process of digestion this fluid is poured on the 
food, and dissolves it into a soft mass, which is called chyme. 
It is nearly tasteless, and without odor, yet it has the quality 
of preventing fobs and will even remove it after it 
