It shall be the duty of the Mayor to appoint a visitor, who shall, as often as once a year, examine the books and accounts of the Trustees of the “Enoch Pratt Free Library of Baltimore City”, and make a report thereof to the Mayor and City Council of Baltimore; and said Mayor and City Council shall, in case of any abuse of their powers by said Trustees or their successors, have the right to resort to the proper courts to enforce the performance of the trust imposed on them. P.L.L., 1888, §760 1915, §789 1927, §789 1930, §789 1938, §969 1949, §597 1969, §17-1 1882, ch. 181 1898, ch. 123, §789