Section 1. From and after the passage of this Act, in all counties of the State of Texas which had a population of not less than forty-three thousand, one hundred and twenty-five (43,125), and not more than forty-three thousand, two hundred (43,200), according to the last preceding Federal Census, the salary of the County Superintendent of Public Instruction shall be Three Thousand, Two Hundred and Fifty Dollars ($3,250) per annum, to be paid in accordance with and in the manner as provided by a General Law governing the maintenance of the office of County Superintendent of Public Instruction.