C 2or ] 
joining that which is in the jar. In this cafe, alfq* 
the air has never failed to be reftored ; but then it 
might be fufpe&ed that the melioration was pro- 
duced by the addition of fome more wholefome 
ingredient. As thefe agitations were made in jars 
with wide mouths, and in a trough which had a 
large furface expofed to the common air, I take it 
for granted that the noxious effluvia, whatever 
they be, were firft imbibed by the water, and 
thereby tranfmitted to the common atmofphere. 
In fome cafes this Was fufficiently indicated by the 
difagreeable fmell which attended the operation. 
After I had made thefe experiments, I was in- 
formed that an ingenious phylician and philofopher 
had kept a fowl alive twenty-four hour, in a quantity 
of air in which another fowl of the fame fize had 
not been able to live longer than an hour, by con- 
triving to make the air, which it breathed, pafs 
through no very large quantity of acidulated water, 
the furface of which was not expofed to the common 
air ; and that even When the water was not acidula- 
ted, the fowl lived much longer than it could have 
done, if the air which it breathed had not been 
drawn through the water. As I fhould not have 
concluded that this experiment would have fucceed- 
ed fo well, from any obfervations that I had made 
upon the fubjeft, I took a quantity of air in which 
mice had died, and agitated it very ftrongly, firft in 
about five times its own quantity of diftilled water, in 
the manner in which I had impregnated water with 
fixed air ; but though the operation was continued a 
long time, it made no fenfible change in the pro- 
perties of the air, I alfo repeated the operation with 
Vol-. LX1I. D d pump 
