12 



THE WORK OF THE DIGESTIVE GLANDS. 



but only through the mucous membrane, the muscular and peritoneal 

 coats remaining intact. The margins of the mucous membrane all 

 round these incisions are separated for a little way from the submucous 

 tissue ; on the side of the stomach for a width of one to one and a half 

 centimetres ; on the side of the flap for two to two and a half centi- 

 metres. The raised edges of mucous membrane belonging to the large 

 stomach are applied to each other for half their width and sewn 

 together. Out of the piece which belongs to the flap a cupola is formed. 

 Both the stomach and the margins of the flap are then closed by sutures 

 along the edges of the first incision. A septum is thus made between 

 their respective cavities, consisting of two layers of mucous membrane ; 



Pylorus 



Plexus gastricu. 

 Bnter/or vagi ' 



Oesophagus 



Plexus gastricus 

 posterior vagi 



FIG. 1. A.-B. Line of incision. C. Flap for forming stomach 

 pouch of Pawlow. 



one, that of the cupola, being intact, the other stitched along the 

 middle. 



It was only by forming the mucous membrane of the flap into a 

 cupola that we were able to retain a dog with a permanent and closed 

 pouch for any length of time. No sooner were the two layers of 

 mucous membrane sewn in the middle line than a communication 

 formed after a shorter or longer time between the stomach and the 

 cul-de-sac. The animal was then useless for our purpose. It is still 

 better to make cupolas out of the mucous membrane on both sides. To 

 describe the matter in a few words, we separated an elongated piece 

 from the stomach, formed it into a cylinder, the orifice of which we 

 sewed into the opening in the abdominal wall, and allowed the other 

 end to remain connected with the stomach. The cavity of the pouch 

 is separated from that of the stomach by a septum formed only 

 of mucous membrane. To make the description clearer, I give 



