Sodium Sulphate In Salt Lake.A member of the Geological Surveysay*that Salt Lake will be of great value in thu near future, not only on account of the common Halt ir will produce, but alsofor the sodium sulphate it contains. Thelatter is separated in a flocoidont precipitate by the cold weather of midwinter, an»l annually thrown upon the slit ire in enormous There are manyother lakes in the fur West Where e aitInexhaustible supply of alkalies may lieobtained at small cost. Mono Lake, OaL, alone being estimated to hold over78,000,‘HX) tons of sodium carbonate.