PART I.] Effects of Section of the Mesenteric Nerves, 139 



experiment, the nerves of the central loop being as before divided whilst those of the 

 lateral loops were left intact. The intestine was then returned to the abdomen and 

 the wound sewed up. 



After the lapse of an hour the abdomen was again opened, and the ligatured 

 loops were examined. The vein of the central loop had become occluded with 

 coagulum, which had caused extreme congestion of the corresponding portion of the 

 gut, but beyond this congestion no other difference existed between the central and 

 the two lateral loops. 



Experiment VI {No. 9). — A large healthy pariah dog was put under the influence 

 of chloroform, and the division of the nerves of a loop of intestine performed in the 

 usual manner. 



Nine hours and a half subsequently the animal was killed with chloroform, and 

 the abdomen opened. The ligatured loop, the nerves of which had been divided, was 

 distended like a sausage, and of an intense black colour. There was extreme 

 extravasation along the lines of the vessels in the corresponding portion of mesentery, 

 and the layers of the latter close to the intestine were widely separated by a 

 wedge-shaped mass of tarry blood. The cavity of the gut was distended with black 

 blood, and the tissues of its walls were infiltrated and thickened with similar fluid. 

 This extreme congestion and extravasation had been caused by the complete occlusion 

 of the vein by coagulum at the site of the section of the nerves. 



Experiment VII (Ao. 16). — A small pariah dog was put under the influence of 

 chloroform, and the operation of section of the nerves of a loop of the small intestine 

 performed in the usual way. 



After an interval of eight hours, chloroform was again administered until death 

 ensued, and an immediate 'post-mortem examiflation was then performed. 



There was no peritonitis. Not the slightest difference could be detected between 

 the central ligatured loop of intestine in which the nerves had been divided, and the 

 two lateral ones in which they remained intact. The mucous surface was exception- 

 ally dry. 



A careful dissection was subsequently made of the portion of mesentery, including 

 the divided nerves, and the division was found to have been almost, if not absolutely, 

 complete. 



Experiment VIII {No. 14). — A healthy pariah dog was put under the influence of 

 chloroform, and the nerves of two loops of the small intestine were thoroughly divided. 

 Into one loop (a), an ounce of tepid water was then injected, whilst the other loop 

 (6) was left empty. 



Nine hours and a quarter subsequently the animal was killed, and the intestines 

 were examined at once. The interior of the first loop (a-) was empty, the mucous 



