Section 1. In all counties of the State of Texas having a population of not less than one hundred and ninety-seven thousand (197,000) and not more than one hundred and ninety-eight thousand (198,000) and all counties with a population of not less than thirty-two thousand, four hundred (32,400) and not more more than thirty-two thousand eight hundred (32,800), according to the last preceding Federal Census, the salary of the county superintendent of public instruction shall be fixed by order of the County Board of Education in and for such counties at an amount not less than Three Thousand Dollars ($3,000) per year and not more than Four Thousand, Two Hundred Dollars ($4,200) per year and said salary shall be exclusive of any and all traveling expenses allowed by law.