C.F.A.O. v. THOME Statutes—Interpretation—Retroactive effect—Landlord and tenant—Premises let out when Rent Control Ordinance, 1947 (No. 30 of 1947), was in force—Ordinance later superceded by the Rent Control Ordinance, 1952 (No. 2 of 1952)—Breach of covenant when Ordinance of 1952 in force—Whether rights of parties to be adjudicated under provisions of the Rent Control Ordinance, 1952 (No. 2 of 1952).