Analyfis of the Air. 1 6j 
coveries, found that a good quantity of Air 
was producible from Vegetables, by put* 
ting Grapes, Plums, Goofeberries, Cherries, 
Peafe, and feveral other forts of fruits and 
grains into exhaufted and unexhaufted re* 
ceivers, where they continued for feveral 
days emitting great quantities of Air. 
Being dcfirous to make fome further re- 
fearches into this matter, and to find whac 
proportion of this Air I could obtain out 
of the different fubftances in which it was 
lodged and incorporated, I made the fol- 
lowing chymio-ftatical Experiments : For, 
as whatever advance has here been made in 
the knowledge of the nature of Vegetables, 
has been owing to ftatical Experiments, fo 
fince nature, in all her operations, ads con- 
formably to thofe mechanick laws, which 
were eftablifhed at her firft inftitution; it is 
therefore reafonable to conclude, that the 
likelieft way to enquire, by chymical ope- 
rations, into the nature of a fluid, too fine 
to be the objed of our fight, muft be by 
finding out fome means to eft i mate what 
influence the ufual methods of analyfing 
the animal, vegetable, and mineral king- 
doms, has on that fubtle fluid 5 and this I 
effeded by affixing to retorts and boltheads 
M 2 hydro- 
