FOOD AND DIGESTION 



349 



gurgling sound by applying a stethoscope to the right side of 

 the spinal column, and any delay caused by a stricture may thus 

 be determined. 



In swallowing fluids two sounds are heard, one immediately, 

 and one after about six seconds. 



III. DIGESTION IN THE STOMACH 



Within recent years the most important work on gastric 

 digestion in the dog has been accomplished by Pavlov on dogs. 

 His method is to make a small gastric pouch opening on the 



FIG. 155. Diagram of Pavlov's Pouch made on the Stomach of a Dog. 

 surface and separated from the rest of the stomach (fig. 155). 

 This is done by cutting out a V-shaped piece along the 'great 

 curvature, the apex being towards the pylorus and the base 

 being left connected with the stomach wall. By a series of 

 stitches the opening thus made in the stomach is closed up 

 (top line of AAS in fig. 155), while the cut edges of the V-shaped 

 flap are stitched together to form a tube. The one end of this 

 is made to open upon the skin surface A, A, and by folding in 

 the mucous membrane the deep end is isolated from the 

 stomach. Thus a pouch is formed still connected with the 

 nerves and vessels of the stomach, the condition of which 

 represents the condition of the whole stomach. 



