...ew Orleans told our informant he could buy any Yankee in that city. Six thousand negroes have been sent from Rhode Island, and arrived at New Orleans a few weeks since; six hundred were sent to Plaquemine , the remainder at the former city. A fine steamer from St. Louis, with a large number of horses, mules, sheep, &c., and seven hundred bales of cotton, took fire just as she arrived at Plaqu...