Article XLVIII of the Amendments to the Constitution is hereby amended by striking out, in that part entitled “II. Emergency Measures”, under the heading “The Referendum”, the words “A separate vote shall be taken on the preamble by call of the yeas and nays, which shall be recorded, and unless the preamble is adopted by two-thirds of the members of each House voting thereon, the law shall not be an emergency law; but” and substituting the following: — A separate vote, which shall be recorded, shall be taken on the preamble, and unless the preamble is adopted by two-thirds of the members of each House voting thereon, the law shall not be an emergency law. Upon the request of two members of the Senate or of five members of the House of Representatives, the vote on the preamble in such branch shall be taken by call of the yeas and nays. But