f 45 ) 
Salt to be feparated from the Colcothar after diftillation ; 
which I oniir, Experience having k ariied me, that it is of the 
fame nature with the former, only fomewhai: more fixed ; and 
if the Spirit be cohobated from the Cafut mortuum^ it is with 
the reft volatilized , nothing remaining befides Mettal and in- 
fipid Earth. 
Tht Saline Principle being that whereon I intend chiefly 
toinfifl-, I fiiall enquire whence ic derives its Original ? what 
fubjeftit doth moft refemble? or with what 'cismoil nearlyal- 
lied? In order to the refo'ution of thefe Enquiries, and 
the confirmation of %rcain Propofitions, hereafter to be men- 
tioned, I (hall premife fome Experiments niade many years 
ago, which perhaps may give no lefsfacisfaftion unto many of 
our Experimental Philofophers, than they afforded me , when 
I firft made mine, 
I took four or five Gallons of the Vitriolate water, which 
was conveyed, by artificial Channels at Deptford , from the 
beds of Pyrites OT t!M^rcajites into the great Ciftern. I <ii- 
ftiiled therefrom io glafs VeflTels two thirds of infipid water 5 
le ting the Goalies coo!, the water let fail a Vitriol of a lovely 
dilute Colour, ( whether green or blewifli I do not remem- 
ber,} together with a great quantity of that yellow Sediment 
which we formerly called Okfr: Then evaporating a third 
part of the remaining liquor, I received more Vitriol of a 
paler colour than the former, and Okerz% before, though 
lefs : The fifth time this operation was repeated , inftead 
of Vitriol it afforded a yellow, and everafter a white, Salr^ 
which did differ exceedingly from Vitriol, not only in colour, 
bu^ alfo tafte ; beingfiery and pungent | did partake little of 
that-abominable rough aftringent fmack which is peculiar to 
Vitriol. Itwa alfounfluous, like Salt of tarur-^ made the 
hands foft and fupp'e, cleanfing Hkea Sap^ i whereas Com- 
mon Vitriol renders hem rough, andharfli: Being diflblved 
in water, it appeared to the very Eye very fatty and oleagi- 
nous. 
Among many other appearances fufBciently remarkable, in 
this 'aft Liqsio anH Salt , [ ilial I only mention thefe few ; 
T. Ol^f From five pounds and a half of Lixivitm^ I re- 
ceived four pounds of this fiery white Salt, befides half a 
pound 
