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but long expofed unto the Air. The caufe whereof feeins the 
very fame with that we lately niencion'd in our account of the 
ptodu&ion of fitriol I thtjllom^ asthatls^ being produced 
by the Sulphurs aflingi?^, corroding (?/, and concoagulaiing 
jr/>^, feme Mineral fubftance, which ufually partakes more 
of terrene and ftony, than metallick, nature i although yet 
Metal is often found to be contained in the Allom , Stone or 
Ore. And that the Sulphur is the chief EfiRcienc and Materi- 
al caufe of its produdtion^ appears from hence, that many 
Allom-ftonesfasthe Vitriolate)difti!"Ied^er defcenfam^ yield 
good Brimftone • and all Allom,ftones or Ore, during Calci- 
nation, emit a fuJphureous Steam. An fnquifitive Naturalift 
of my acquaintance did gather from the very fame rock, and 
that within a few inches of each other, Vitriol, Allom, and 
Sulphur \ all of them excellent and perfeft in their kind. In- 
deed they are fj neerly allied, that I can by fome pretty arti- 
fices (too long to behere defcribed) convert Allom into Vi- 
triol, or Vitriol into Allom, which fliall be the fame to all 
intents and purpofes (as we commonly fpeak) with the Natu- 
ral. 
Allom d'iitiWtd into an Acid fpirit with Copper orlron^ 
becomes good Vitriol; and Vitriol ht^A from its metallick 
parts becomes Aluminous; and diftilled,yields a Spirit fcarce- 
]y to be diftinguiflit not only by taft, but even by the moftnice 
and accurate fcrutiny, from that of Allom. And (which doth 
in fome meafure illuftrate this Affinity) I have often obferv'd 
reftified Oyl of Vitriol and Spirit of Sulphur to coagulate and 
become folid tranfparent concretions , exaftly refembling 
Allom cryftallized, with which compared, I am confident , 
the moft judicious Eye, without the afliftance of the palat, 
would find little difference. 
Having analy fed /^/'mW, andlhewed, that it is ufually pro- 
duced by Sulphur aftingon, and con-coagulating with, a me- 
tal ; and that Allom is the Refult of the faid SuIphur,compre- 
hendcd in, or united with, bodies lefs metallick and more ter- 
rene ; and having, I think, fully evinced, that Sulphur, Vi- 
triol, and Allom do agree in the Saline Principle, which is in 
all originally the fame, perhaps a little changed bv the bodies 
w^ith 
