iSo Anal^fis of the Air^ 
But when the acid fulphur, which we fee 
ads vigoroufly on air, is taken out of any 
fuel, the remaining Salty Water and Earth 
are not inflammable, but on the contrary 
quench and retard fire 5 and as' air cannot 
produce fire without fulphur, fo neither can 
fulphur burn without air: Thus Charcoal 
heated to an intcnfe degree for many hours 
in a clofe veflel 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 
fooner is it expofed to the free air, but the 
fulphur, by the violent adion and re-adion 
between that and the elaftick 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 a Brimjlone Match which was 
placed in an exhaufted receiver was heated 
by the focus of a burning glafs fo as to melt 
the Brimfloney yet it did not kindle into 
fire nor confume, notwithftanding the 
ftrengthand vigour of the adion and re- adion 
that is obferved between light and fulphure- 
ous bodies. Which is afligned by the illufi 
trious Sir Ifaac Newtoriy as one reafon 
why fulphureous bodies take fire more 
‘‘ readily. 
