Opium. Regulations 2 relating to importation, exportation, and transshipment of opium or coca leaves or any compound, manufacture, salt, derivative, or preparation thereof under act of May 26, 1922, as amended by act of June 7, 1924, and acts of June 14, 1939, and June 17, 1930, as amended by act of Aug. 5, 1935, narcotic regulations, effective date, June 1, 1938.