of fyeat ant* ColD. 47 



of an Alcalizate Salt in Lime , yet 

 that it contains alfo an Acid Salt, has 

 not, that I remember, been proved 5 

 and if the emerging of Heat be a 

 fufficient reafon to prove a latent a- 

 cid Salt in Lime, I know not, why I 

 may not inferr, that the like Salt lies 

 conceard in other bodies, which the 

 Chymiftstaketobeof the pureft or 

 meereft fort of Alcalys. 

 For I have purpofely EXPER. I. 

 tried, that by putting a 

 pretty quantity of dry Salt of Tar- 

 tar in the palm of my hand, and wet- 

 ting it well in pold water , there has 

 been a very (enfible Heat produced 

 in the mixture} and when I have 

 made the trial with a more confides 

 able quantity of fait and water in a 

 Viol, the heat proved troublefbme- 

 ly intenfe , and continued to be at 

 leaft fenfible a good while after. 



This Experiment feems to favour 

 the opinion, that the Heat produced 

 in Lime whilft 'tis quenching, pro^ 

 ceeds from the Empyreuma , as the 

 Chymifts call it, or impreffion left 

 D 3 by 



