• 









i2o 



Analjfis of the Air. 



But when the acid fulphur, which we fee 

 acts vigoroufly on air, is taken out of any 

 fuel, the remaining Salt, Water and Earth 

 are not inflammable, but on the contrary 

 quench and retard fire ; and as air cannot 

 produce fire without fulphur, fo neither can 

 fulphur burn without air: Thus Charcoal 

 heated to an intenfe degree for many hours 

 in a clofevefTel will not burn as in the open 

 air, it will only be red hot all the time like a 

 mafs of Gold without wafting : But no 



i 



fooncr is it expofed to the free air, but the 

 fulphur, by the violent action and re-action, 

 between that and the elaltick air, is foon fe- 

 parated and carried off from the Salt and 

 Earth, which are thereby reduced from a 

 folid and hard to a foft impalpable calx. 



And when zBrzmftone Match which was 

 placed in an exhaufted receiver was heated 

 by the focus of a burning glafs fo as to melt 

 the Brimftone, yet it did not kindle into 

 fire nor confnme, notwithstanding the 

 ftrength and vigour of the action and re- action 

 that is obferved between light and fulphure- 

 ous bodies. Which is afligned by the iliuf- 

 trious Sir Ifaac Newton, as " one reafon 

 « why fulphureous bodies take fire more 



" readily, 



U 



:;: 



l 



* 



111 



