Analyfis of the Air. 277 
bum zo 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 exhaufied receiver was by 
means of a burning glafs firft filled with the 
fumes of brown paper with Nitre , and then 
filled with frefh air, the nitrous paper upon 
applying the burning glafs did freely deto~ 
nize 5 and a Candle put into a like air, burnt 
for 2 s''; which in a frefh air, in the fame 
receiver, burnt but 43"; 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, for a Candle will not burn, nor 
the Nitre detonize in a very rare, nor a 
very thick air whence the reafon why the 
Nitre detonized, and the Candle burnt, 
when placed in the receiver, after frefh air 
was let in upon the fumes which were 
made in vacuo , was that thofe fumes were 
much difperfed and condenfed on the Tides 
of the glafs, upon the rufhing in of the 
frefn air, for the fumes were then much 
more rare and cranfparent, than before the 
air was let in. 
T s 
That 
