, BOS 
Mr. Cavennisn’s Experiments on Air. 126 
diftinguifh as fmall a proportion as if the felenite _ been ori-~ 
ginally no more foluble than ufual. 
The nature of the neutral {alts made with the hilseiticonl 
vitriolic and nitrous acids has not been much examined by the 
chymifts, though it {eems well worth their attention ; and it 
is likely that many befides the foregoing may differ remarkably 
- from thofe made with the fame acids in their common ftate, 
- Nitre formed with the phlogifticated nitrous acid has been 
found to differ confiderably from common nitre, as well as a. 
Polychreft from vitriolated tartar. 
In order to try whether any vitriolic acid was produced by 
the phlogiftication of air, 1 impregnated fifty ounces of diftilled’ 
water with the fumes produced on mixing fifty-two ounce 
meafures of nitrous air with a quantity of common air fufficient 
to decompound it. This was done by filling a bottle with 
fome of this water, and inverting it into a bafon-of the fame, 
and then, by a fyphon, letting in as much nitrous air as filled 
it half-full; after which common air was-added flowly by the 
fame fyphon, till all the nitrous air was decompounded. When’ 
this was done, the diftilled water was further impregnated in’ 
the fame manner till the whole of the abovementioned quan- 
tity of nitrous air was employed. This impregnated water,, 
which was very fenfibly acid to the tafte, was diftilled in a glafs: 
retort. The firft runnings were very acid, and {melt pun- 
gent, being nitrous acid much phlogifticated ; what came next 
had no fenfible tafte or fmell; but the laft runnings were very 
acid, and confifted of nitrous acid not phlogifticated.' Scarce 
any fediment was left behind. Thefe different parcels of dif- 
tilled liquor were then exaétly faturated with falt of tartar, and: 
evaporated; they yielded 87% grains of nite, which, as faras’ 
I’could perceive, was diihdned with vitriolated tartar or any 
E other 
