by the United States government

“ The Secretary of the Treasury is authorized to deposit public money in any such institution, and shall prescribe such regulations as may be necessary to enable such institutions to become depositaries of public money and fiscal agents of the United States. Each such institution shall perform all such reasonable duties as depositary of public money and fiscal agent of the United States as may be required of it including services in connection with the collection of taxes and other obligations owed the United States. ”

“ June 20, 1939, ch. 214, § 2, 53 Stat. 842; Apr. 13, 1943, ch. 62, § 1, 57 Stat. 65; Aug. 5, 1947, ch. 492, §§ 2, 4, 61 Stat. 773; June 25, 1948, ch. 645, § 21, 62 Stat. 862; Oct. 15, 1949, ch. 695, § 4, 63 Stat. 880 ”