crude Tartar all at ooce^ but at feveral times^ faecaufe cl/e all 
the fermcDted part would quickly get out at the edges of the 
Gucurbit : Now then^^ fierce every time there is^ by the addi- 
tiou of the Fixt Salt, fo much of the Volatil Acid freed out of 
the crude Tartar, as much as there is added of Fixt Salt, and 
that prefcatly flycs away, ft certainly follows^ Thatjif by in- 
jeftioDs feveral times repeated you come at laft to the poiot of 
Saturation, there will remain no volatil Alcalifat fait at all of 
the crude Tartar. 
Since therefore there is no hopes of obtainiog the Volatil 
Salt from crude Tartar this way, we muft endeavour to get it 
by an addition of Tartar calcined, or Fixt Sakj and howthis 
is to be done, hath been already intimated, ^i^. by the fepa* 
ration of the Earthy parts. For as the volatil Alcalifac par- 
tides, upon a very vehement colliquation of the fire, are, by 
an intimat union with the Earthy parts,^ kept from amending 5 
foa^fo , when freed from thefe Terreftrial fetters, they are re- 
ftored to their former freedom and volatility. And this Se- 
pararioo of the Earth we obtain by this Fermentation of the 
Tartar ^ for, in the fame moment that the Acid portion of the 
crude Tartar is conjoined with the Tartar's Fixt Salt, tofet 
the Volatil Alcali of the crude Tartar at liberty 5 there is alfo 
made a precipitation of thatinfipid Earth, which by the ex* 
tream degree of Fire was united with the Salt of Tartar, and 
had fixed it before. 
But to expofe this Fixing Earth to the view of all, I fliall 
alledge the Example of Vitriolat Tartar^ known to the very 
Apprentices of Apothecaries* In this operation , whilft the 
Spirit of Vitriol is afFufed to the diflblv'd Salt of Tartar or its 
Oyl made per deliquiumy you may obferve a very great EfFer- 
vefccnce, during which and the aftion of the Acid of the Vi- 
triol upon the Alcali of the Tartar, there is precipitated an 
Earth (for the feparation of all which, care is to be had of the 
degree of Saturation between the Spirit of Vitriol and the Salt 
ofTartar,) which afterwards may befeverd byfiltration.Now 
that this Earth is precipitated not out of the Spirh of Vitriol, 
but rather the Salt ofTartar, none, verfed in thefe thingsjcaii 
be ignorant of. This precipitated Earth fomc call the Magi- 
Aaaaaa ftery 
