(44) 
fore this purification. This operation will not fucceed in a 
dry digeltion ; I mean, Aflies, Sand, Filings of Iron, Steel, 
open Fire, or even fiame of Lamps , whether fed with Oil or 
Spirit of Wine. This Earth may alfo be obtained m a great 
proportion, though in another torm, if afcer a longand in- 
tenfe Calcinaiion the Vitriol is freed from its remaining Salt 
by frequent ablutions with warm Water : The far greateil part 
of this dulci6td Colcothar is mfipid Earth with f: me fmall 
proportion of Meital. The fame may be precipitated by 
Salt of Tartar, or any other Alcalies, or filings of Zinkj or 
other immature Minerals^out of af jlucfonof Vitriol in Com- 
mon water : It being alfo feparated from Metalline and Saline 
parts, by a method I fhall hereafter mennon , there remains 
a great quantity of an infipid fubfiance nearly refembling 
burnt Allom ; Befides, whereas 5W^,iV/>r^,€^c.require indiftil- 
lation a largqiian ity of Earthy fubllance to dibjoyn the Sa- 
line parts , and prevent: fufion ; Vitriol and Allom need it 
not ; an unqjeftionable proof, that Earthy parts abound 
therein. 
That Vitriol contains is evinced by the Sulphure- 
ous fmell it emits in difriilation , efpecialiyif urged with a 
flrong fire from the beginnings and the Spirit thus drawn be- 
ing reflified, the Liquor, which firft ari fes, hath a highly Sul- 
phureous fmell , as hath aTo that we fhall hereafter mention, 
diftilled from Vitriol deprived of its Metallick parts. The 
CokotPjar dulcified , or Metallick parts precipitated by an 
Alcali, or immature Mineral , fub'imed with Sal Armoniack., 
an inflammable Sulphur maybe many wavs feparated , both 
from the fublimate and Caput mortuum. The Comrron Oil of 
Vitriol digeftedon Antimony, then di^illed , yields a much 
greater quantit\/of Sulphur, than would have been produced, 
had any o:.her acid liquor been imp oyed ; and rhe fame Oil 
of Vitriol digefled with Spirit of Wine, and difti] ed, yields 
'an Oil, and at the tatcer enditore of Sulphureous inflammabJe 
flowers. 
As for the ^c/^ Saline Principle, T fuppofenoperfon who 
ha^h tafted theSpintof Vitriol, and ^ hat abuUvely called^ its 
"Oil, will queftion its abounding in tbar fubjefl. 
Spme add uqto .the Principle?.,, :we haye enumerated, ,tbe 
i: e Salt: 
