An Act amending the act of August 5, 1932 (Sp. Sess., P. L. 45, No. 45), entitled, as amended, "An act empowering cities of the first class to levy, assess and collect, or to provide for the levying, assessment and collection of, certain additional taxes for general revenue purposes; ***," limiting the rate of the tax on wages and net profits as it is levied upon certain persons.