Section, R.S. 339; acts Mar. 3, 1875, ch. 129, 1, 18 Stat. 352; Feb. 14, 1903, ch. 552, 10, 32 Stat. 829; Aug. 23, 1912, ch. 350, 1, 37 Stat. 407; Mar. 4, 1913, ch. 141, 1, 37 Stat. 736; Mar. 1, 1919, ch. 86, 40 Stat. 1256, required quarterly reports of exports and imports. See section 301 et seq. of Title 13, Census.