r 346 ] 
3. The neck of the urinary bladder of the fame 
animal was well fecured with a ligature, and con- 
tained about two or three ounces of fluid. The 
bladder funk immediately on being put into warm 
water ; but, upon exhaufting the receiver, many 
filver-like globules appeared upon the furface of it ; 
and it foon fhewed manifeft ligns of expanfion, and 
rofe to the top of the veffel. The fame experiment 
was tried with it wiped dry, and laid on the floor of 
the receiver, and the refult was, that its expanfion 
and contraction were very perceptible to the eye. 
In January 1773, by the affiftance of Mr. Web- 
ster, an ingenious furgeon from Montrofe, the 
above experiments were repeated in the manner fol- 
lowing. 
A part of the vena cava inferior of a large fwine, 
which was killed by fome ftrokes on his head with 
an axe, was intercepted, when full of blood, be- 
tween two ligatures. The part was about an inch 
and ap'half long, and held, by conjecture, near an 
ounc^ of blood ; this was immerfed in warm water, 
as foon as it was cut out of the warm body, and 
immediately put into the receiver of an air-pump. 
The air was well exhaufted, and again let into the 
receiver repeatedly, without any appearance of en- 
largement of the vein; which mull; have been eafily 
perceivable by its afeending in the warm water. 
The fame experiment was tried on the urinary 
bladder, with the fame fuccefs, the urethra being 
tied with a ligature, whilft it was flill in the body. 
The gall bladder rofe in the warm water, though 
the bile-dudt was tied before it was taken out of 
the body, and had air bubbles appearing on its tides, 
like 
