Analyfis of the Air. 187 



iC And does it not readily pervade all bodies, 

 <c Optic, qu. 18. The elaftick force of this 

 " medium, in proportion to its denfity, muft 

 11 be above 490,000,000,000 times greater 

 w than the elaftick force of the air is, in pro- 

 " portion to its denfity, ibid.qu. 21." A force 

 fufficient to give an intenfe degree of heat, 

 efpecially when its elafticity is much increafed 

 by the brisk action and re-action of particles 

 of the fuel and ambient air. 



From this manifeft attraction, action and 

 re-action, 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 ; which par- 

 ticles, while the Lime was hot, were in a 

 very a&ive, attracting and repelling flare; 

 and being, as the Lime cooled, detained in 

 the folid body of the Lime, at the feveral at- 

 tracting and repelling diftances they then hap- 

 pended to be at, they muft neceffarily con- 

 tinue in that fix'd ftate, notwithstanding the 

 ethereal medium, which is fuppofed freely 

 to pervade all bodies, be continually follicit- 

 ing them to action : But when the folid fub- 



ftance 



