2 8 o Jnalyjts of the Ah. 



pears by Experiment 74, where 224 times 

 its bulk of air arofe from a quantity of Sal 

 Tartar. And for the fame reafon it is that 

 common Nitre y when thrown into the Fire, 

 flames, tho' its Spirit will not, viz. becaufe 

 there is much elaftick air in it, as appears 

 from Experiment 72, as well as from the 

 great quantity of it, generated in the firing 

 of Gun-powder. 



The reafon why Sal Tartar, when thrown 

 on live Coals, does not detonize and flame 

 like Nitre, (notwithstanding, by Experiment 

 74, plenty of elaftick particles did arife from 

 it) is this, viz. becaufe by the fame Experi- 

 ment, compared with Experiment 72, it is 

 found, that a much more intenfe degree of 

 heat was required to extricate the elaftick air 

 from Sal Tartar, the more fix'd body, than 

 from Nitre ; the great degree of Fire with 

 which Sal Tartar is made, rendering the 

 cohefion of its parts more firm ; For it is 

 well known that Fire, inftead of difuniting, 

 does in many cafes inseparably unite the parts 

 of bodies : And hence it is that Puhis Ful- 

 minans, which is a mixture of Sal Tartar, 

 Nitre and fulphur, gives a greater explofion 

 than Gun-powder : Becaufe the particles of 

 ihe Sal Tartar cohering more firmly in a 



fix'd 



