JULY 24TH—Yesterday we received a letter from Col. Bartow, written just before the battle (in which he fell, his letter being received after the announcement of his death), urging the appointment of his gallant young friend Lamar to a lieutenancy. I noted these facts on the back of his letter, with the Secretary’s approbation, and also that the request had been granted, and placed the letter, perhaps the last he ever wrote, in the archives for preservation.