Mo. Rev. Stat. § 81.220

81.220. Notice of proposed change — when to take effect (cities of 20,000 and less than 250,000). — Upon any ordinance for such purpose being introduced into the common council, the latter shall, before the passage thereof, by resolution, require the city clerk to publish a copy of the ordinance in at least one daily newspaper published in the city, to be designated in the resolution, for at least three weeks within the four weeks next after the passage of said resolution. After such publication, proof thereof shall be made and filed with the city clerk, and, if the common council shall be satisfied that such publication has been made, it shall, by vote, so find, and the city clerk shall make a record of such finding in the book for record of the current proceedings of the common council, which record shall be conclusive evidence of the truth of the facts so found. If such ordinance be passed by the common council at the first or second regular meeting after such publication and finding, and not later, and duly approved by the mayor, the same shall thereafter be in force until repealed or altered. Any such ordinance shall be subject to amendment before such publication, but not after.

(RSMo 1939 § 7516) Prior revisions: 1929 § 7363; 1919 § 8777; 1909 § 9633