274 Analyfis of the Air. 



And the quicker the fucceflion of this frefh 

 air is, by blowing, the more vigoroufly does 

 a fire burn. 



If the continuance of the burning of the 

 Candle be wholly owing to the vivifying 

 fpirit, then fhppofing in the cafe of a recei- 

 ver, capacious enough for a Candle to burn 

 a minute in it, that half the vivifying fpir it 

 be drawn out with half the air, in ten fe- 

 conds of time j then the Candle fhould not 

 go out at the end of thofe 10 feconds, but 

 burn 20 feconds more, which it does not > 

 therefore the burning of the Candle is not 

 wholly owing to the vivifying fpirit, but 

 to certain degrees of the air's elafticity. 

 When a wholly exhaufted receiver was by 

 means of a burning glafs firft filled with the 

 fumes of brown paper with Nitre, and then 

 rilled with frefh air, the nitrous paper upon 

 applying the burning glafs did freely deto- 

 nize j and a Candie put into a like air, burnt 

 for 28 "$ which in a frefh air, in the fame 

 receiver, burnt but 43 "3 but when the fame 

 receiver with air in it, was filled full of 

 fumes of detonized Nitre, and a Candle 

 placed in that thick vapour, it went out 

 inftantly 5 for a Candle will not burn, nor 



the 



