On the Muriate of Soda, or — Salt. 3 
robably harder than the other There is an extensive 
ormation of rock salt on each side of the Carpathian an moun- 
tains for six hundred miles, from Weleiska in Poland to ene 
mie in Moldavia. Rock salt and salt springs most — 
occur near the feet of extensive mountain ranges, whic 
adds probability to ac opinion that these ranges were once 
boundaries of extensive lakes of salt water. In some parts 
of Africa there are salt akon which rest on beds of solid rock 
salt: these beds were probably formed ri fresh depositions 
of salt as the nest evaporates. Near Algiers the salt lakes 
are dried u er, and leave immense 
salt at the trom 
The lake Yelta, beyond the river Volga, supplies all Rus- 
sia with salt 
Muriate of soda is most generally associated with beds of 
clay, which frequently alternate with those of the salt ; sand, 
sandstone, and compact, fetid and bituminous liméstone 
usually accompany the deposits of salt. But the most in- 
timate connexion exists between this salt and the sulphate 
of lime or gypsum, over which the beds are usually placed, 
or sometimes they even alternate with it. e constant 
occurrence of the muriatic and sulphuric acids in the same 
situations is an interesting fact, which, in a more advanced 
state of chemical and ogice cal science oe serve to eluci- 
date the formation of gypsum and rock — 
In the United States, salt oe 
ins and a There i = no salt obtai r Arkansas 
boring, t + usual —e ° procuring it in other ities. 
anew any salt am Missouri ; in pies of 
on the Wabash. 
There is one manufactory in operation at Toots on a trib- 
* Philosophical Transactions, Vol. 77, and Foster’s Introduction to Mineralo- 
gy, page 32. 
