(43) 
with fome fiiiall portion of the Volatil Aerial Salt, 
That it containsiF^^^r, needs no great proof, fince no Sa- 
line fubftance can cryftallize without it ; and diftilJation 
will convince any perfon, that it exceeds in quantity any of 
the other Principles. 
The Earth or Oker may be thus feparated : DifToI ve Vitrio! 
in fair water, inniiediately a yellow powder will feparate^ 
and in a fliort timefubfide: The greater the quantity of wa- 
ter imployed, the more Oker precipitates: The weaker the 
lixivium^ the lefs able to fupport Bodies more ponderous 
than common water : And the lighter the Water (as if diftil- 
led rain-water,or phlegme of vinous Spirits,)the more Earthy 
parts fubfide, upon the fame Hydroftatical principle I juft 
now mentioned. I have above twenty times repeated this dif- 
folution, fecondedby iiltration and coagulation , and each 
time feparated fome quantity of this Earthy and am per« 
fwaded , had I long continued the operation , the fuccefs 
would have been the fame ; only I obferved the quantity fe» 
parated each time fenfibly to diminifii: And Baftlm VaUmnm 
aflTures^that at length theVitrlol will let fall no more fediment; 
and that then it is the fubjed of mod noble operations by 
him particularized ; which they who have leifure, and con- 
fidence in his fpecious promifes, may do well to try. I have 
found a more eafie and expedite way of ePeding this fepara- 
tion, which may be of great ufe to them who work on Vitriol, 
much abbreviate their labour, and confiderably leflen their 
expence. 
Take a good quantity of the common , Dmtzkkj or 
Hungarimy Vitriol; having powdredit, put it into a flender 
Cucurbite, place it in Water, keep underit an equal conftanc 
fire three or four days; The Vitriol without additament will 
become fluid, as if diflfolved in water, and theOkerwithmoft 
of the Metalline parts, with the grofs Sulphur, will fubfide, 
arid become a hard Cake at the bottom, the Vitriol being 
fluid above it, which in the cold again Cryftallizeth^ ex- 
cepting a fmall quantity of liquamenof ^ he fame nature with 
that we fliall hereafter mention ; This repeated once or twice, 
the Vitriol attains unto a high -degreeof purity , and is eafily 
capable of many alterations, whereunco it was not fubjedbe- 
G 2 fore 
