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of thofe, which, from their infolubility, may be ufed with ac- 

 curacy in delicate experiments to determine the proportions of 

 the conftituent parts of bodies. But if, with this mode of 

 operating, we compare the quantities of real acid, faid (in thofe 

 excellent tables with which Mr. Kirwan has enriched the fci- 

 ence) to be contained in fulphuric acid of different fpecific 

 gravities, they will ferve as proofs of their mutual validity ; 

 ^nd perhaps demonflrate, that fulphuric acid, as well as water> 

 and fome other bodies, may of itfelf enjoy liquidity, at the teajr 

 perature and preffure which ad upon our g^lobe. 



"5 



ii 



