i.v- 



DIGESTION 



ing the animal with food thai has been impregnated with bismuth sub- 

 nitrate, then exposing him to the x-ray and either taking instantaneous 

 photographs of the shadows or observing them by means of a fluorescent 

 screen. The descriptions of the original observations made by Cannon 



Fig. 154. — Schematic outline of tin stomach. At C is the cardia; /■'. fundus; IA, incisura an- 

 nularis; U. body; PC, pyloric canal; P, pylorus. (From Cannon.) 



on the stomach of the cat have been so little modified by observations 

 on man that we may take them as a convenient type. In the accompany- 

 ing figure (Fig. 156) the outline of the shadow cast by the stomach is 

 shown at intervals of an hour each during digestion. Soon after the 



A U 



Fig. 155. — Diagrams of outline and position of stomach as indicated by skiagrams taken on 



man in the erect position al intervals after swallowing food impregnated with bismuth subnitrate. 



A, moderately full; B, practically empty. The clear space at the upper end of the stomach is due 



to gas, and it will he noticed that this " tomach bladder" lies close to tin heart. (From '1'. Win- 



Todd.) 



