- 33 Mr. CAVENDISH’s Experiments.on Air. 
qs it 1s found, that the phlogifticated air, which it is converted 
into, is very final in comparifon of - the dephlogifticated ali, 
. think the feeond ef thefe explanations feems much the 
mot likely 5, as it was. found, that the acid. in: the: -condenfed 
Jiquor was, of the nitrous: kind, not only. when the dephlo- 
ejfticated air was prepared from: red precipitate, but alfo. when 
it was. procured from plants ; or from turbith mineral: and. it 
feeems not likely, that air procured from plants, and fill lefs. 
likely that.air procured from a folution of AREREHEY in : oil of 
wtriol, fhould contain any nitrous.acid. ) * 
} Another ftrong argument. in favour of: this opinion | is, ae 
dephlogifticated air yields no nitrous. acid when phlogifticated 
by liver of fulphur; for if this air contains nitrous acid, and 
yields it when phlogifticated by explofion with inflammable ally 
it is very extraordinary that it fhould not do fo when palegitte 
cated by other means. ; iy 
But what forms a ftronger and, I ssinatt almoft' decifive: 
argument in favour of this explanation is, that when the de- 
phlogifticated ait is very pure, the condenfed liquor is made 
much more ftrongly acid by mixing the air to be exploded with 
a little phlogifticated air, as appears by the following expe- 
riments. 
A mixture of 18500 grain meafures of inilanninadlite air with 
9750 of dephlogifticated air procured from red precipitate were 
exploded in the ufual manner; after which, a mixture of the 
fame quantities of the fame dephlogifticated and inflammable 
air, with the addition of 2500 of air phlogifticated by iron 
filings and fulphur, was treated in the fame manner. The 
condenfed liquor, in both experiments, was acid, but that in 
the latter evidently more fo, as, appeared alfo by faturating 
each of them feparately with marble powder, and precipitating 
7 ‘the 
