Some very successful experiments have teen made with Lake Superior iron ore, and mar hie as a flux, by which very excellent iron has been made by S K Gay, as we learn by the Lake Superior Journal The experiments were made at Marqu'ette, 411 charges being tried in a small furnace to test the flux, as it was supposed by many that it would not answer, but the iron was of a superior quality, and as the ore is plenty in that region, a great increase in the manufacture of the metal is anticipated As marble is a carbonate of lime, there can be no doubt but it may be used for a flux in smelting where the common limestone cannot be obtained For this purpose it should be reduced to very small pieces or to powder