230 



THE PANCREAS. 



The gland was hardened in alcohol and a section of it was 

 stained with carmine. The clear portion at the base of the cells 

 takes the stain better than the more granular, internal portion. Fig. 



FIG. 125. Pancreas of dog during hunger; preserved in alcohol and stained in 

 carmine (after Heidenhain). 



126 represents a section from a dog that had been fed from six to 

 ten hours before the gland was removed ; the encroachment of the 

 clear upon the granular portion is shown by the greater width of 



FIG. 126. Pancreas of dog during first stage of digestion ; alcohol, carmine (after 



Heidenhain). 



the stained zone. In other words, the granules are being used up 

 to form these products, the enzymes. Fig. 128 represents the 

 cells when they have returned to a condition of rest. 



