Ho A SYSTEM OF 



The feas contain this fait, though 

 more or lefs in different parts. In Si- 

 beria and Tartary there are lakes that 

 contain great quantities of fak. 



SECT. CXXXI. 



C. 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-fp rings 

 are found, but they contain very little 

 fait : and fuch weak water is called folen 

 by the Swedes *, 



SECT. CXXXIL 



2. Saturated with a volatile alcali, Acidum falis 

 communis alcali .volatili faturatum, Native 

 fal ammoniac, Sal ammoniacum naturale. 



This is of a yellowim colour, and is fub- 

 limed from the flaming fents or crevices at 

 the Solfatara near Naples. See Seel. cxli. 



* This division of the natural common falts is generally 

 adopted, and not without reafon, fince the tafte of all differs 

 $ 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 

 ftill be precipitated, which diflblves in acids, and feems to 

 be of a calcareous nature. The naturalifls have troubled them- 

 felves a great deal to find out, how common fait is produced 

 in the earth, and from whence the great (lore of it in the ocean 

 is fupplied : but they have propofed nothing but conjecture^ 

 without any wife ijlufirating the main queftipn. 



SECT. 



