_Muriate of Soda_ or common salt, exists in most of the states and territories of this Valley. Near the sources of the Arkansas incrustations are formed by evaporation during the dry season, in the depressed portions of the immense prairies of that region. The celebrated salt rock is on the red fork of the Canadian, a branch of the Arkansas river. Jefferson lake has its water strongly impregnated with salt, and is of a bright red color. Beds of rock salt are in the mountains of this region. Several counties of Missouri have abundant salt springs. Considerable quantities of salt are manufactured in Jackson, Gallatin and Vermillion counties, Illinois. Saline springs, and "licks" as they are called, abound through Kentucky, Tennessee, Indiana, Ohio, Western Pennsylvania, and Western Virginia. Salt is manufactured in great abundance at the Kenhawa salines, 16 miles above Charlestown, Va., and brought down the Kenhawa river and carried to all the Western States. Much salt is made also on the Kiskiminitas, a branch of the Alleghany river, at the Yellow creek above Steubenville, and in the Scioto country in Ohio. The water is frequently obtained by boring through rock of different strata, several hundred feet deep. Copper, antimony, manganese, and several other minerals are found in different parts of the West, but are not yet worked. _Nitrate of potash_ is found in great abundance in the caverns of Kentucky and Tennessee, also in Missouri, from which large quantities of Saltpetre are manufactured. _Sulphate of Magnesia_ is found in Kentucky, Indiana, and perhaps other states. Sulphur and other mineral springs are very common in the western states.