I 34 Mr, Cavenpisn’s Experiments on Air. 
{mall tior the large’ globe could be perfeétly exhaufted of air, 
and there was no: faying with exactnefs what quantity was left 
in them; but in moft of them, after allowing for this uncer=. 
tainty, the true quantity of burnt air feemed not more than 
7th of the dephlogifticated air employed, or 7th of the mix-. 
ture, It feems, however, unnecefiary to determine this point 
exactly, as the quantity is fo fmall, that there can be little doubt: 
but that it proceeds only from the impurities mixed with the 
dephlogifticated and inflammable air, and confequently that, 
if thofe airs could be obtained perfeétly pure, the whole would 
be condenfed. 
With refpec&t to common air, and dephlogifticated air re- 
duced by the addition of phlogifticated air to the ftandard 
~ of common air, the cafe is different; as the liquor condenfed 
in exploding them with inflammable air, I believe I may fay in 
any proportion, is notat all acid; perhaps, becaute if they are 
mixed in fuch a proportion as that the burnt air is not much 
phlogifticated, the explofion is too weak, and not accompanied 
with fufficient heat. 
All the foregoing experiments, on the explofion of inflam- 
mable air with common and dephlogifticated airs, except thofe 
which relate to the caufe of the acid found in the water, were 
made in the fummer of the year 1781, and were mentioned - 
by me to Dr. PrizsrLtey, who in confequence of it made 
fome experiments of the fame kind, as he relates in a paper 
printed in the preceding volume of: the Tranfactions.. During 
the laft fummer alfo, a friend of mine gave fome account of 
them to M. Lavoisier, as well as of the conclufion drawn 
from them, that dephlogifticated air is only water deprived of 
phlogifton ; but at that time fo far was M. Lavotsizr from 
thinking any fuch opinion warranted, that, till he was pre=) 
5 vailed 
