Analyfts of the Air, i 
up a tripplc fpace or fomething more : For 
which reafon the leaft retorts are beft for 
thefe Experiments. The cxpanfion of the 
diftilling bodies was fometimes very little, 
and fometimes many times greater than that 
of the Air in the retort, according to their 
different natures. 
When the matter was fuffieiently diflilled, 
the retort &c. was gradually removed from 
the fire, and when cool enough, was carried 
into another room, where there was no fire. 
When all was throughly cold, cither the 
following day, or fometimes 3 or 4 days af- 
ter, I marked the furface of the water /, 
where it then flood 5 if the furface of the 
water was below z, then the empty fpace 
between y and z Ihewed how much Air was 
generated, or raifed from a fix’d to an elaf- 
tick flate, by the adtion of the fire in diflil- 
lation : But if y the furface of the water 
was above z, the fpace between z and y, 
which was filled with water, fhewed the quan- 
tity of Air which had been abforbed in the 
operation, i. e. was changed from a repel- 
ling claflick to a fix’d flate, by the ftrong 
attraction of other particles, which I there- 
fore call abforbing. 
When 
