Whenever the Secretary of Agriculture deems that the delegation of the whole or any part of any regulatory function which the Secretary is, now or after April 4, 1940 , required or authorized to perform will result in the more expeditious discharge of the duties of the Department of Agriculture , he is authorized to make such delegation to any officer or employee designated under this section. The Secretary is authorized to designate officers or employees of the Department to whom functions may be delegated under this section and to assign appropriate titles to such officers or employees. There shall not be in the Department at any one time more than two officers or employees designated under this section and vested with a regulatory function or part thereof delegated under this section. The Secretary may at any time revoke the whole or any part of a delegation or designation made by him under this section. (Apr. 4, 1940, ch. 75, § 2, 54 Stat. 81 ; Pub. L. 89–554, § 8(a) , Sept. 6, 1966 , 80 Stat. 632 , 650.) Editorial Notes Codification Section was formerly classified to section 450d of this title prior to editorial reclassification and renumbering as this section, and to section 516b of Title 5 prior to the general revision and enactment of Title 5, Government Organization and Employees, by Pub. L. 89–554, § 1 , Sept. 6, 1966 , 80 Stat. 378 . Amendments 1966— Pub. L. 89–554 repealed third sentence which related to grade of a position. See section 5109 of Title 5 , Government Organization and Employees.