For the purpose of the collection the city clerk may divide the city into as many districts as deemed necessary for the convenient collection of garbage, rubbish and waste matter, and may fix a day or days upon which the same shall be collected in the districts. Such division and such fixing of day or days shall be deemed in effect from and after the publication of notice thereof in a newspaper of general circulation printed and published in the county, or posted as provided by law. Such divisions and days may be varied from time to time, at the discretion of the city clerk, but any variation shall be effective only when notice thereof shall have been published in a newspaper of general circulation printed and published in the city, or posted as provided by law. (Ord. 117 § 21, 1972)