Mr, Cavenvisn’s Experiments on Air. 1297 
which the common air was confined being 23 times as big: as. 
the other. 
In trying the experiment, the magazines belag firft filled 
with their refpective airs, the glafs cylinder was taken off, and 
water let, by the two holes, into the outer veffels, till the airs 
began to iffue from the ends of the copper pipes; they were 
then fet on fire by a candle, and the cylinder put on again in 
its place. By this means upwards of 135 grains of water were 
condenfed in the cylinder, which had no tafte nor {mell, and 
which left no fenfible fediment when evaporated to drynefs ; 
neither did it yield any pungent fmell during the evaporation 5 5 
in fhort, it feemed pure water. | 
In my firft experiment, the evlindstt near that part. where 
the air was fired was a little tinged with footy matter, but 
very flightly fo; and that little feemed to proceed from the 
putty with which the apparatus was luted, and which was 
heated by the flame; for in another experiment, in which it 
was contrived fo that the luting fhould not be much ° heated, 
fcarce any footy tinge could be perceived. 
By the experiments with the globe it appeared, that) when 
inflammable and common air are exploded:in a proper propor- 
tion, almoft all the inflammable air, and near one-fifth of the 
common air, lofe thew elaflicity, and are condenfed into dew. 
And by this experiment it appears, that this dew is plan wa- 
ter, and confequently that almoft all the inflammable air, and 
about one-fifth of the common air, afe turned into pure water. 
: In order to examine the nature of the:matter condenfed on 
firmg a mixture of dephlogifticated and inflammable air, J took 
a glafs globe, holding 8800 grain meafures, furnifhed with a 
brafs cock and an apparatus for firing air by electricity, ‘This 
globe was well exhaufted by an air-pump, and then filled with 
: Wer. LXXIV, S a mixture 
