Analyfis of the Air. 287 
“ elaftick and a&ive? And does it not rea- 
“ dily pervade all bodies, Optick qu . 18. 
<c The elaftick force of this medium, in 
cc proportion to its denfity, maft be above 
u 490,000,000,000 times greater than the 
“ elaftick force of the air is, in proportion 
€C to its denfity, ibid. qu. 21.” A force 
fufficient to give an intenfe degree of heat, 
efpecially when its elafticity is much increa- 
fed by the brisk a&ion and re-a&ion of par- 
ticles of the fuel and ambient air. 
From this manifeft attra&ion, a&ion and 
re-aclion, that there is between the acid, ful- 
phureous and elaftick aereal particles, we 
may not unreafonably conclude, that what 
we call the fire particles in Lime, and feve- 
ral other bodies, which have undergone the 
fire, are the fulphureous and elaftick parti- 
cles of the fire fix’d in the Lime 5 which par- 
ticles, while the Lime was hot, were in a 
very aftive, attra&ing and repelling ftate > 
and being, as the Lime cooled, detained in 
the foiid body of the Lime, at the feveral 
attracting and repelling diftances, they then 
happened to be at, they muft neceflarily 
continue in that fix’d ftate, notwithftanding 
I the ethereal medium, which is fuppofed 
* freely to pervade all bodies, be continually 
follh 
