ON THE NATURE OF INTESTINAL SECRETION. 67 
Kepevimen 37.—Effect of ligature of the mesenteric veins. Three loops of 
intestine were isolated as usual, but nothing was injected into any of them. 
The veins passing along mesentery from the middle loop were carefully 
isolated and ligatured. 
On examination, 
Middle loop contained 6°5 ec. ¢, of coagulated blood. 
Upper _,, 
Lower 
Mucous membrane and all the coats of the middle loop were intensely 
congested, the mucous membrane being more so than the other coats. There 
was very little mucus upon it. 
Upper loo 
Tae oe } pale. 
\ empty. 
Series IIT. 
Experiment 38.—Division of the mesenteric nerves. Three loops were 
isolated as usual. Nothing was injected, but the nerves passing along the 
mesentery to the middle one were carefully sought for and divided. No 
microscopic examination was made afterwards, however, and it is therefore 
uncertain whether all the filaments were divided or not. The animal 
weighed 5 lbs. 
On examination, 
Middle loop 
Upper _,, all empty. 
Lower ,, 
Mucous membrane :— 
Middle loop 
Upper ,, all dry. 
Lower ,, 
Experiment 38 a—This experiment was repeated on another animal with 
a similar result. 
Experiment 38 b.—Division of the mesenteric nerves, Three loops of intes- 
tine were isolated by ligatures, In one of them the vessels were carefully 
isolated, and the nerves and remaining structures in the mesentery connected 
with the loop were divided, 
On examination, 
Operated loop contained 15 e. e. of fluid, 
_ Other loops empty. 
Mucous membrane :— 
Operated loop somewhat congested. 
Other loops normal. 
Experiment 39.—Division of both splanchnics. The loops were isolated 
as usual; nothing was injected into any, but both splanchnic nerves were cut, 
The animal weighed 53 lbs. 
On examination, about four hours after the operation, 
Middle loop 
‘Upper ,, | all empty. 
Lower ,, 
Mucous membrane :— 
Middle loop 
Upper ,, | all pale and contracted, 
- Lower ,, 
F2 
