( $108 ) ^ 
This Earth th€0,when by the Fire *tis intimately united with 
tht Salts^ and has been io a manner vitrified with them, keeps 
them fo clofc together^ that they can no more rife and fly a- 
way tkax^birds faftn d to a rook 5 thofc Salts being rendred fo 
fix, that by a gentle fire they are not fo much as at all movcd j 
by aftrong one, brought tofufions and, united with a con- 
fiderable quantity of Earthy particles, by an cxtream degree 
of heat vitrified. So if you mix fixt Salt of Tartar with Cio- 
naber of Antimony, or with Quickfilver, all the Quickfilver, 
though a very ponderous body, will pals into the Retort, but 
the Salt of Tartar by reafon of its Earth remain at the bottom 
of the Veflel. Whence he cfteems it evident, that the Fixt 
Alcalies,cfpccially that of Tartar, cannot, by reafon of the 
coliiquation of the Earthy parts, penetrate into bodies to be 
difiblved, norconftquently remove the inmoft feeds of Dif- 
cafes. 
N0W5 in the jeMmt place, though the Volatilin^ng fuch Fixt 
SaltSjand particularly that of Tartar, have been hitherto found 
^ very difficult work ; yH doth our Author conceive it would 
bevery eafie, if we took but Nature for our Guide, and but 
feparatedfrom Salt of Tartar the Fm^g Earth^, that has been 
proved to be mixed with it. For the doing of which he re- 
fers to the prefcript of Dr* Lattgelot , requiring that the Fixt 
SaltofTartar be mixed with its genuin Ferment, viz. crude 
Tartar, or (ifin the Fermentation you have a mind to fee the 
grape like bubles) Crcme of Tartar, and fo expos'd to fer- 
mentation* In which commixture of Ferment he would have 
thisefpeciallyobfcrv'd, that it be mixed to the very degree 
oUaturatioft, and untill the fermenting agitation and the mo- 
tion of the faline particles do ceafe, as a fign, that there is not 
any particle of the fixt fait of Tartar left un-conjoioed with 
the acfd particles of the Crude Tartar or its Creme, sor any 
acid part of the crude ^artar not Saturated by the Fixt Salt, 
Which being obferved, the Diftillation will, the adion of the 
Salio particles being thus ftopp^d , the more fecurely be 
done. Mean time, that only the Acid particles of the crude 
Tartar are laid hold on by the Fixt Salt, and not the Alcalifat, 
he promiffs a proof of hereafter. 
But 
