The sum of twenty-five thousand dollars is appropriated, or so much thereof as may be necessary, out of any money in the Treasury of the United States not otherwise appropriated, for the completion of a monument to the memory of the soldiers who fell in the battle of New Orleans in the war of eighteen hundred and twelve, said monument to be completed under the direction and approval of the Secretary of the Army: Provided, That the State of Louisiana shall cede and transfer its jurisdiction to the property on which said monument is to be completed in accordance with the provisions of act numbered forty-one of the legislature of that State, approved July nineteenth, nineteen hundred and two: Provided further, That when said monument is completed the responsibility of maintaining the same and keeping the grounds surrounding it shall hereafter rest with the Government of the United States; and there is authorized to be appropriated from time to time, out of any money in the Treasury not otherwise appropriated, such sums as may be necessary for such expenses.