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Joining that which is in the jar. In 'this cafe, alfo? 

 the air has never failed to be reflored ; but then it 

 might be fufpe&ed that the melioration was pro- 

 duced by the addition of fome more wholefome 

 ingredient. Asthefe 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. 

 I,n fome cafes this was furficiently indicated by the 

 difagreeahle fmell which attended the operation. 



After I had made thefe experiments, I was in* 

 formed that an ingenious phyficiaii 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 lohger than it could have 

 done, if the air which it breathed had not been 

 drawn through the water. As I mould not have 

 concluded that this experiment would have fucceed- 

 ed fo well, from any obfervations that I had made 

 upon the fubjecl, 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 fennble change in the pro* 

 per ties of the air, I alfo repeated the operation with 

 Vol. LX1L D d pump 



