( 5i89 ) . 
But Goce the main Queftion is about the New Volatilifdtim 
of the Fixed Sales, the Author is altogether perfuaded^ thst 
in his FeraicDtation ot Tartar 'tis not chiefly the v^xy Fixed Al- 
calioftartarthu is agaio volatilifed, but rather the added 
Fermentj which is the Crude tarl^r^ For in this crude Tartar^ 
thoughthere bcDo fix't SaltiDira {which he hathaflcrted ge- 
nerally of all MixtSj) yet the volatil Aicaiifate partieks of the 
Tartar are detained by the Volatil Acids of the fame , cora- 
mixed with it to the very degree of (aturation 5 whence they 
arefixedj forafmuch as theie two when coo joioed do fix pae 
another, when feparated, become again Volatil. Which 
manner, of Fixation he calls Natural^ being Ihcw'd usby 
ture ; as that, which is made by the Colliquation of the Earth 
by Fire, Jrti^cial^ becaufe poly perform'd by Art j upon the 
account of which^ Volatil Salts are detained no other wife 3 
than Birds tycd to a rock are reftrained froai flying a- 
way* 
Now, though indeed the Fixed Alcali of Tartar is in this 
fermentation freed from that Earth, to which by the fufion of 
thefireit was intimately united 5 yet notwlthftaoding this, 'tis 
- fiwd Bg!AWfpiHb hi,by iht Acid of the Tartareous Fcrment^Fot 
the clearer proof of which^ he mafees ufe of the Urinous Spirit 
of Sal Atmoniac^ in which there are two Volatil SaltSj an Uri- 
pous, and Acid. Thele two Salts, faith he, though they be 
Volatil whenfeparate, yet when united they detain one ano- 
ther, emulating as 'twere the nature of Fixt ones, fince they 
are neither diflblved in the Air, nor emit any odour, as true 
Volatils are wont to do. Now to obtain out of this Salt the 
Urinous volatil Spirit, there is requifite aSepafatipn of thefe 
two Salts 3 for this bond being dfflblved, the Urinous imme- 
diatly riftth. To obtain which, water is powred upon the 
Sal Armomac (becaufe Salts ail not but when diflblved,} -and 
then there is added a Fixt Sal Alcali^ which whilft 'tis Joined 
with the Acid portion pf the 4*^/ Armoniac^ (for the more fixed 
Add is fooner united with the fixed Alcali, than with the Vo- 
latil p ) the volatil Vrinous part quickly dcferts its (tWowAcid^ 
and being coBjoined with the water, yields a moft volatil and 
piercing fpirk, which, chough the Sa^l ArmoniM before the 
com* 
