Analyjls of the Asr. 107 
depths, down to the greateft depth that a 
line will reach, thereby to difcover, whe- 
ther or how much the fpring of the air is 
difturbed or condenfed, not only by the 
great preffure of the incumbent water, but 
alfo by its coldnefs at great depths j and in 
what proportion, at different known depths," 
and in different lengths of time , that an al- 
lowance may accordingly be made for it 
at unfathomable depths. 
This gage will alfo readily fliew the de- 
grees of compreflion in the condenfing en- 
gine. 
But to return to the fubjeft of the two laft 
Experiments, which prove the elafticity of 
this new generated air 5 which elafticity is 
fuppofed to confift in the aftive aerial par- 
ticles repelling each other with a force^ 
which is reciprocally proportional to their 
diftances. That illuftrious Philofopher, Sir 
Ifaac Newton, in accounting how air and 
vapour is produced, Opticks ^er. 3 1 . fays, 
“ The particles when they are fliaken off 
‘‘ from bodies by heat or fermentation fo 
foon as they are beyond the reach of the 
‘‘ attraction of the body receding from it, 
[[ as alfo from one another, v/ith great 
ftrength 
