The cases of negroes secreting themselves on board vessels bound for the Northern ports, are getting to be of frequent occurrence. The bark New England left this port for Boston a week ago, and after getting fairly out to sea, a negro appeared on deck, and attracted the notice of the captain, to whom he reported himself as a runaway, who had been induced by one or two of the crew to hide himself on board, with the promise that on getting into blue water he would be safe. Though at a great inconvenience to himself the captain returned to the Balize, and put him on board of the Pilot-boat, which brought him back to the city last evening. The runaway out he brig Otoman, whose capture in Boston excited such a burst of philanthropic feeling there, arrived here on the 13th on the bark Niagara, and has been handed over to his master.--N. O. Correspondence Charleston Courier.