Affairs in the overflowed districts of Louisiana. Letter from the Secretary of War, transmitting copy of a telegram of the 9th instant from the Deputy Quartermaster-General in charge of the Quartermaster General's Office, to the Quartermaster at New Orleans, and a copy of his reply thereto, of the 12th instant, together with a copy of his report of the 14th instant in regard to the condition of affairs in the overflowed district of St. James and Ascension Parishes, La.