Section, acts Mar. 28, 1922, ch. 117, title I, 42 Stat. 484; Jan. 5, 1923, ch. 24, title I, 42 Stat. 1125; May 28, 1924, ch. 204, title III, 43 Stat. 238; Feb. 27, 1925, ch. 364, title III, 43 Stat. 1047, which related to the commutation of rations of officers and crews on vessels, was provision of an appropriation act which was confined to specific appropriations.