C 345 ] 
the received of an air-pump ; and, as the- air wa b 
exhauding, the blood began to fwell, and to rife in 
bubbles, till it occupied above ten times its original 
fpace. 
As falfe reafoning is, in no fcience, of more dan- 
gerous confequence, than in that of medicine, I per- 
luaded myfelf the removal of this error might be 
thought worthy the attention of the Royal Society. 
In April 1772, Mr. young, an ingenious furgeon 
at Shiffnal in Sbropfhire, and Mr. waltire, who 
gives very accurate ledtures in natural philofophy, 
made, at my requed, the following experiments. 
1. A part of the jugular vein of a fheep, with the 
blood in it, was included between two drift liga- 
tures, during the animal’s being alive, and being cut 
out with the ligatures, was immediately put into a 
glafs of warm water, and placed in the receiver of 
an air-pump : it funk to the bottom of the water, 
and would not rife when the air was diligently ex- 
hauded,, It was then wiped dry, and laid on the 
brafs floor of the receiver, and the air again exhauded, 
but there was not the lead vidble expanfion of the 
vein, or its contents. 
2. A ligature was put round the neck of the 
gall-bladder of the fame animal, as foon as it was 
daughtered ; the gall-bladder, with the bile in it, 
was fird put into water, in which it funk, and was 
placed in the exhauded receiver of the air-pump j 
and was afterwards wiped dry, and laid on the brafs 
plate at its bottom, as in the former experiment ; 
but in neither cafe, on the greated degree of ex- 
haudion, did it fhew the lead alteration of its bulk., 
Vol. LXIV. Yy 3. The 
