Analyfts of the Air. 1 6 1 
and inclined the inverted glafs a jy and 
bolthead almoft horizontally in a large vef- 
fel of water, that the water might run in- 
to the glafs a y 5 when it was almoft up to 
a the top of the bolthead, I then immerfed 
the bottom of the bolthead, and lower part 
y of the cylindrical glafs under water, rai- 
fing at the fame time the end a uppermoft. 
Then before I took them out of the water? 
I fet the bolthead and lower part of the cy- 
lindrical glafs a y into the earthen veffel x x 
full of water, and having lifted all out of 
the great veflel of water, I marked the fur- 
face ^ of the water in the glafs a y. 
If the ingredients in the bolthead, upon 
fermenting generated Air, then the water 
would fall from z> to /? and the empty fpace 
s y was equal to the bulk of the quantity 
of Air generated : But if the ingredients 
upon fermentation did abforbe or fix the 
aftive particles of Air, then the furface of 
the water would afeend from z to riy and 
the fpace z riy which was filled with water, 
was equal to the bulk of Air, which was 
abforbed by the ingredients, or by the fume 
arifing from them : When the quantities of 
Air, cither gcaerated or abforbed, were very 
M gi^car. 
