Section 121, R.S. 1740; acts Apr. 5, 1906, ch. 1366, 3, 34 Stat. 100; Feb. 5, 1915, ch. 23, 6, 38 Stat. 806; Feb. 27, 1925, ch. 364, 43 Stat. 1017, related to commencement of salary of officers. Section 122, act June 11, 1874, ch. 275, 4, 18 Stat. 70, related to fixing of travel time allowances.