know of, at leaft with us in England : And fince the Py- 
rites naturally and only yeilds it, it is but reafonable 
wherever Brimftone is found, though in the Air, or un- 
der Ground in Vapour, to think that that alfo proceeds 
from it. 
If it be objected, that there is a Sulphur vive or Na- 
tural Brimftone, which is no Pyrites. I anfwer, that I 
am not willing to grant this, but do take all pure Sul- 
phur to have been once produced by the fire : For what 
is found in and about the burning Mountains, is certain- 
ly the effeds of Sublimation: and thofe great quantities 
of it faid to be found about the skirts of the Vulcano's 
is only an argumentof the long duration, and Vehemen- 
cie of thofe fires. 
If it be further objeded, that the Sulphur Vive, indeed, 
or ruffe Brimftone, as they call it, had from Haecla and 
Italie is Opaque, and agrees not with the tranfparent and 
Amber-like Sulphur Vive of the Ancients, fo that the 
miftake is in the Druggifts, that we have not right Natu- 
ral Brimftone; I reply, that grant the difference, yet it 
does not follow, that that alfo was not produced by Sub- 
limation^ no more, then that the StalaiStites, or water 
wrought Stone , is not fo made for that fome of it is 
found Opaque and fome Cryftalline. 
But this we will grant; that, poffibly, the Pyrites of 
the Vu:!cano's or burning Mountains may be more Sulphu- 
reous then ours. And, indeed^ it is plain, that fome of 
ours in England are very lean, and hold but little Sul- 
phur; others again very much. 
And this may be one reafon, why England is fo little 
troubled with Earth-quakes ; and Italie and almoft round 
the Mediterranean Sea fo very much. 
Another reafon is ; the Paucity of Pyrites in England; 
where they are, indeed, fome little in all places, but 
moftly Sparfimj and if perchance in beds, thofe are com- 
paratively thinn, to what probably they are in the burn- 
