Section 1. SALARIES IN CERTAIN COUNTIES. In all counties of the State of Texas having a population of not less than thirty-two thousand eight hundred (32,800) and not more than thirty-two thousand eight hundred thirty (32,830), and in all counties having a population of not less than twenty-four thousand (24,000) and not more than twenty-four thousand sixty-three (24,063), and in all counties having a population of not less than thirty-seven thousand nine hundred (37,900) and not more than thirty-seven thousand nine hundred fifty (37,950), and in counties having a population of not less than twenty-seven thousand four hundred twenty-five (27,425) and not more than twenty-seven thousand four hundred sixty (27,460), and in counties having a population of not less than thirty-one thousand three hundred twenty-five (31,325) and not more than thirty-one thousand four hundred twenty-five (31,425) and in counties having a population of not less than forty-eight thousand five hundred (48,500) and not more than forty-eight thousand five hundred seventy-five (48,575), and in counties having a population of not less than eleven thousand four hundred (11,400) and not more than eleven thousand five hundred (11,500), and in counties having a population of not less than seventeen thousand seven hundred sixty (17,760) and not more than seventeen thousand seven hundred eighty (17,780), the salary of the County Superintendent of Public Instruction shall be not less than Two Thousand Seven Hundred Fifty ($2,750.00) Dollars and not more than Three Thousand ($3,000.00) Dollars per annum, the amount of which salary shall be fixed by the order of the County Board of Education for the respective counties, and the County Board of Education for each of the counties coming within this bill shall, by order entered in its minutes, set the salary for each of their respective counties.