( ?8 ) 
Take of the Salt of Kali -well purified, ift. dif- 
folve it in Water, add thereto of Cryjlals of Tar- 
tar about life ft ; boil the whole in order to diffolve 
the Cryjlals of Tartar. But the exa£t Proportion 
of Cryjlals of Tartar can be no more determined 
in this Operation, than in making the Tartarum fo- 
lubile ; either becaufe the Salt of Kali has retain’d 
more or lefs. Humidity in its Cryftallization, or be- 
caufe the Tartar has more or lefs ’Impurities in it. 
But if there be too much Tartar in the alcaline 
Liquor, after the Fermentation is over, filtrate the 
• Liquor, and as it cools, the fuperfluous Tartar will 
fall to the Bottom. After the Separation of the 7i?r- 
tar from the Liquor, evaporate the Lixivium by a 
gentle Heat, fet it in a cool Place to cryftallize, and 
you will have very fine Cryjlals. If the Liquor 
be evaporated a little too much, there will be no 
Cryjlals of Salt formed, but the Liquor will be 
converted into a hard tranfparent Mafs, not unlike 
Glue. But if you diffolve this Mafs again, you may 
make it cryftallize, as upon diffolving Seignette ’ s 
Salt. 
This Salt purges very well, from one to two 
Ounces diffolv’d in a Quart of Water. 
Such is the Difcovery of this Salt, which has hi- 
therto paffed for an Arcanum, 
We have.likewife his cryftallized alcaline Salt, 
which is the Salt of Kali , that diffolves not in-the 
Air. I am actually at work in perfefting this Salt, 
in examining that of Kali , and comparing 
it with Borax * From this laft l extract Glauber’s 
Salt, 
