Section, act June 14, 1935, ch. 240, §§ 1–5, 49 Stat. 340, which fixed the quantity of Manila and other fibre products, produced in the Philippine Islands, to be admitted into the United States duty free, by its own terms originally expired three years from May 1, 1935. By Proc. No. 2272, eff. Jan. 26, 1938, 3 F.R. 222, 52 Stat. 1534, the effective period was extended for an additional three years from and including May 1, 1938.