Mr. CAVENDIsH’s Experiments on Air. I 31, 
known, could tell the quantity of burnt air in the {mall globe 
before the communication was made between them. By this 
means the whole quantity of the burnt air was found to be 
2950 grain meafures; its {tandard was 1,85. ; 
The liquor condenied in the globe, in weight about on 
grains, was fenfibly acid to the tafte, and by faturation with 
fixed alkali, and evaporation, yielded near two grains of nitre; 
fo that it confifted of water united to a {mall quantity of ni- 
trous acid. No footy matter was depofited in the globe. The 
dephlogifticated air ufed in this experiment was procured from. 
red precipitate, that is, from a folution of quickfilver in fpirit 
of nitre diftilled till it acquires a red colour. 
Asit was fufpected, that the acid contained in the condened 
liquor was no effential part of the dephlogifticated air, but was 
owing to fome acid vapour which came over in making it and had 
not been abforbed by the water, the experiment was repeated in 
the fame manner, with fome more of the fame air, which had 
been previoufly wafhed with water, by keeping it a day or two 
in a bottle with fome water, and fhaking it frequently ; whereas 
that ufed in the preceding experiment had never pafied through 
Water, except in preparing it. ‘The condenfed liquor was ftill 
acid. ; 
The experiment was alfo repeated with dephlogifticated air, 
procured from red lead by means of oil of vitriol; the liquor 
condenfed was acid, but by an accident I was prevented from 
determining the nature of the acid. 
I alfo procured fome dephlogifticated air from the leaves of 
plants, in the manner of Doctors Incennousz and PRIESTLEY, 
and exploded it with inflammable air as before; the condenfed 
liquor ftill continued acid, and of the nitrous kind, 
S 2 | 3 Tn 
