MOUNT VEENON. Of all the spots associated with the National Metropolis, Mount Vernon is beyond all question the most interesting and attractive. It is situated on tho southern branch of the Potomac, fiftoen miles from Washington and eight from Aloxan- dria. Heretofore the most usual mode of visit ing it has been by Steamboat to Alexandria and the balanco of the way by carriage, but within the past year a Steamboat line has been established directly to tho spot itself. The entire plantation contains several hundred acres of land : and the mansion is of wood, two stories high, ninety-six feet in length, and with a portico extending the entire length. The Central part of tho house was built by Lawrence Washington, brother to tho General, but the wings were added by the General himself, and the whole named by him after the famous Admiral Vernon, under whom Lawrence Washington had servod. It occupies an elevated position from which may bo seen a reach of some twenty or thirty miles of tho noble Potomac, extending both to- the eastward and to the westward. The Ladies’Mount Vernon a»u ciati-n now hAds this property it, tru«t The 129 MOUNT VERNON.- EAST FRONT.