132 Mr. Cavennisn’s Enperiments on Air. 
In all thefe experiments the proportion of inflammable air 
was fuch, that the burnt air was not much phlogiiticated; and 
it was obferved, that the lefs phlogifticated it was, the more: 
acid was the condenfed liquor. I therefore made another expe= 
riment, with fome more of the fame air from plants, in which 
the proportion of inflammable air was greater, fo that the 
burnt air was almoft completely. phlogifticated, its ftandard 
being 3. ‘The condenfed liquor was then not at all acid, but: 
feemed pure water:, fo that it appears, that with this kind of 
dephlogifticated air, the condentfed liquor is not at all acid, 
when the two airs are mixed in fuch a proportion that the 
burnt air is almoft completely phlogifticated, but 1s confiderably 
fo when it is not much phlogifticated. 
In order to fee whether the fame thing would obtain with: 
air procured from red precipitate, I made two more experi- 
ments with that kind of air, the air in both being taken from: 
the fame bottle, and the experiment tried in the fame manner,, 
except that the proportions of inflammable air were different... 
In the firft, m which the burnt air was almoft completely 
phlogifticated, the condenfed liquor was not at all acid. In. 
the fecond, in which its ftandard was 1,86, that 1s, not much. 
phlogifticated, it was confiderably acid; fo that with this.air, 
as well as with that from plants, the condenfed liquor contains,. 
or is entirely free from, acid, according as the burnt air is lefs: 
or more phlogifticated ; and there can be little doubt but that 
the fame rule obtains with any other kind of dephlogifticated: 
air. 
In order to fee whether the acid, formed by the explofion of 
dephlogifticated air obtained by means of the vitriolic acid, 
would alfo be of the nitrous kind, I procured fome air from. 
turbith mineral, and exploded it with inflammable: air, the 
propor- 
