Chapter 251 of the Acts of 1942, as amended by Chapter 81 of the Acts of 1946, codified as § 3035r of Michie Code 1942, relating to pensions, etc., for officers and employees of any city having a population of not less than 100,000 nor more than 170,000, and of any city adjoining a county having a density of population of more than 1,000 per square mile, is continued in effect.