Mr. Cavenvisn’s Experiments on Air. 133: 
proportion being {uch that the burnt air was not much  phlo- 
gifticated. ‘The condenfed liquor manifefted an acidity, which 
appeared, by faturation with a folution of falt of tartar, to be 
of the nitrous kind ; and it was found, by the addition of fome 
terra ponderefa falita, to contain little or no vitriolic acid. 
- When inflammable air was exploded with common air, in 
fuch a proportion that the ftandard of the burnt air was about’ 
., the condenfed liquor was not in the leaft acid. There is. 
no difference, however, in this refpect between common air, 
and dephiogifticated air mixed with phlogifticated in fuch a 
proportion as to reduce it to the ftandard of common air; for 
fome dephlogifticated air from red precipitate, being reduced 
to this ftandard by the addition of perfectly phlogifticated air, 
and then exploded with the fame proportion of inflammable 
air as the common air was in the foregoing experiment, the 
condenfed liquor was not in the leaft acid. | 7 
From the foregoing experiments it appears, that when a: 
mixture of inflammable and dephlogifticated air is exploded in 
fuch proportion that the burnt air is not much phlogifticated, 
the condenfed liquor contains a little acid, which is always of 
the nitrous kind, whatever fubftance the dephlogifticated air is. 
procured from; but if the proportion be fuch that the burnt 
air is almoft entirely phlogifticated, the condenfed liquor is: 
not at all acid, but feems pure water, without any addition 
whatever; andas, when they are mixed in that proportion, 
very little air remains after the explofion, almoft the whole: 
being condenfed, it follows, that almoft the whole of the in- 
flammable and dephlogifticated air is converted into pure wa- 
ter. It is not eafy, indeed, to determine from thefe experi- 
ments what proportion the burnt air, remaining after the explo- 
fons, bore to the dephlogifticated air employed, as neither the: 
Zo: {mall 
