Inn 
ing Mountains, as the vaft quantity of Sulphur thence 
fublimed doth feem reafonably to imply: Alfo, if we com- 
pare our Earthquakes, and our Thunder and Lightning 
with theirs 5 There it lightens almoft daily, efpeciallyia 
Summer time, lere feldome ; there Thunder and Light- 
ning is of long Juration, here foonoveri there the Earth- 
quakes are frequent, long, and terrible^ with many Pa- 
roxifms in a day, and that for many days ; here very fliort, 
a few minutes, and Scarce perceptible. To this pur« 
pofe, the Subterraneous Cavities in England are fmall, 
and few compared to the vaft Vaults in thofe parts of 
the World ' which is evident^ from the liaddain appea- 
rance of whole mountains and Iflands. 
If yet itfliall be infifted on, that there are other in- 
flamable Minerals befides the Pyrites; we grant there are 
fo, but by the providence of God not to be found in En- 
gland,, that I know of, and not in any quantity in any 
place of the World, that lean learn; which is well for 
Mankind , becaufe they are very Poyfons , as the Orpi- 
ments ^ but they are all fpecifically diftind: from Brim- 
ftone; which as we have Ihewn, no Oreyeilds but Iron ;So 
the Orpiments are all Gold Ore- and for fuch the Emperor 
Nero ( 2LS Pliny tQ&i&QS who who was of his time and his 
Courtj caufed them to be wrought in quantity, but they 
would not turn to account. And, by the by,fome Authors 
have affigned this as a good reafon,againft any Medicine, 
that fliall be made out of Gold ('as fond as we are of an J^- 
rum potabile ) as having naturally a deleterious quality. 
But this is befides my purpofe. 
The fecond Paper of the fame per f on concerning the 
Spontaneous firivg of the Pyrites. 
IFitjfhall be ob'eded, that no Body is kindled by if: 
A felf : I anfwer, thatic feems to me apparently other- 
