...he National steamer De Soto, arrived at Key West, Fla.--Major-General Halleck, having relinquished the command of the department of the Mississippi, left Corinth for Washington, D. C., accompanied by General Cullum , Col. Kelton, and an aid-de-camp.--The bill authorizing the issue of postage and other government stamps as currency, and prohibiting banks and other corporations or individuals from issuing notes be...