i 40 A SYSTEM OF 
The Teas contain this fait, though 
more or lefs in different parts. In Si- 
beria and Tartary there are lakes that 
contain great quantities of fait. 
SECT. CXXXI. 
r. Spring fait, Sal fontanum. 
. - Is produced by boiling the water of 
the fountains near Halle in Germany, and 
other places. Near the city of Lidko- 
ping, in the province of Weftergottland, 
and in the province of Dal, falt-fprings 
are found, but they contain very little 
fait : and fuch weak water is called fokn 
by the Swedes 
SECT. CXXXIL 
2. Saturated with a volatile alcali, Acidum falls 
communis alcali volatlli faturatum. Native 
fal ammoniac, Sal ammonlacum naturale. 
This is of a yellowifh colour, and is fub- 
limed from the flaming fents or crevices at 
the Solfatara near Naples. See Seft, cxli. 
* This divifion of the natural common falts is generally 
adopted, and not without reafon, hnce the tafte of all differs 
a little from one another, which depends on the lefs or 
greater mixture with heterogeneous fubftances. For out of 
the pureft of thefe falts, a little of an earthy fubftance may 
Hill be precipitated, which diffolves in acids, and feems to 
be of a calcareous nature. The naturalills have troubled them- 
felves a great deal to find out, how common fait is produced 
in the earth, and from whence the great ftore of it in the oCean 
is fupplied : but they have propofed nothing but conjedure^ 
\yitho|it any wife fll ultra ting the main cjueftion. 
SECT, 
