Removal of prisoners to New York.
--From the Baltimore Exchange, of Tuesday last, we learn that Messrs. Howard, Gatchell and Davis, three of the Police Commissioners of Baltimore, together with seven other persons, most of whom are citizens of Maryland, were placed on board the steamer Joseph Whitney, at Baltimore, on Monday, and carried, as is supposed, to New York, there to be imprisoned at the pleasure of Mr. Lincoln. All of them were formerly confined in Fort McHenry.
