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air be thrown over the fide of the veffel, the fmoke, 

 which is mixed with it, will fall to the ground, as if 

 it was fo much water, the fixed air being heavier than 

 common air. 



The red part of burning wood was extinguifhed in 

 this air, but I could not perceive that a red-hot poker 

 was fooner cooled in it. 



Fixed air does not inftantly mix with common air. 

 Indeed, if it did, it could not be caught upon the 

 fermenting liquor ; for a candle put under a large 

 receiver, and immediately plunged very deep below 

 the furface of the fixed air, will burn fome time. 

 But veffels with the fmalleft orifices, hanging with 

 their mouths downwards in the fixed air, will in 

 time have the common air, which they contain, per- 

 fectly mixed with it. When the fermenting liquor 

 is contained in vefTels clofe covered up, the fixed air 

 is rendered much flronger, and then it readily affects 

 the common air which is contiguous to it ; fo that, 

 upon removing the cover, candles held at a con- 

 fiderable diftance above the furface will inftantly go 

 out. I have been told by the workmen, that this 

 will fometimes be the cafe, when the candles are 

 held more than half a yard above the mouth of the 

 veflel. 



Fixed air unites with the fmoke of refin, fulphur, 

 and other electrical fubftances, as well as with the 

 vapour of water j and yet, by holding the wire of a 

 charged phial among thefe fumes, I could not make 

 anv electrical atmofphere, which furprized me a 

 good deal, as there was a large body of this fmoke, 

 and it was fo confined, that it could not efcape me. 

 1 alfo held fome oil of vitriol in a glafs veffel within 



the 



