•\ 



> « 





Aialyfis of the Air. 177 



quently thofc fubftanccs mould take fire, 

 and bum for a Ihort time at kail, which yet 

 they did not. 



And that the air's elafticity conduces much 

 to the intenfe burning of Fires, feems evident 

 from hence; that Spirit of Nitre (which 

 by Experiment 75 has but little claftick air 

 in it) when poured upon live Coals, cx- 

 tinguilhcs inftead of invigorating them : 

 But Spirit of Nitre, when by being mixt with 

 Sal Tartar it is reduced to Nitre, will then 

 flame, when thrown into the Fire, viz. be- 

 caufe Sal Tartar abounds with claftick acreai 

 particles, as appears by Experiment 74, where 

 224 times its bulk of air arofe from a quan- 

 tity of Sal Tartar. And for the lame reafon 

 it is that common Nitre, 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 

 Hke Nitre, (notwithstanding by Experiment 

 74 plenty of claftick particles did arife from 

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



T 3 



ment, 



J i' if 







1 ** 



1 1 





