SECTION 1. Paragraph three hundred and twenty, section nine, of the Act of Congress of August fifth, nineteen hundred and nine, entitled "An Act to raise revenue for the Philippine Islands, and for other purposes", is hereby amended to read as follows:
"320. Cinchona bark, sulphate and bisulphate of quinine, alcaloids and salts of cinchona bark, in whatever form, and plasmochin and its compounds."