Sec. 3. COUNTIES OF NOT OVER 70,000 WITH TWO CITIES OVER 13,800. From and after the passage of this Act in all counties of the State of Texas having a population of not more than seventy thousand (70,000), according to the last preceding Federal Census, and having at least two (2) incorporated cities within their boundary with a population of more than thirteen thousand, eight hundred (13,800) each, according to the last preceding Federal Census, the salary of the county superintendent of public instruction shall be not less than the sum of Two Thousand, Eight Hundred Dollars ($2,800) per annum nor more than the sum of Three Thousand, Eight Hundred Dollars ($3,800) per annum, to be fixed by the county board of education of each of such counties, and in making the annual per capita apportionment to the schools of such counties, the county board of education of such counties shall make an annual allowance out of the State and county available school funds for the payment of the salary of the superintendents of public instruction for such counties; and in addition thereto, office expenses of an amount not in excess of Three Hundred Dollars ($300) per annum for stamps, stationery and telephone; and said county board of education is also authorized to allow for traveling expenses of such county superintendents a sum not in excess of Three Hundred Dollars ($300) per annum to defray the expenses incurred by such county superintendents, which said sum shall be paid by said county board of education upon certificate of such superintendents that the expenses have been incurred in the discharge of their duties as such superintendents, and the salary and expenses herein provided to be paid monthly upon the order of the school trustees; providing that the salaries for the month of September shall not be paid until the county superintendent of public instruction shall have presented a receipt or certificate from the State Superintendent of Public Instruction showing that he has made all reports required of him, that the expenses provided for herein shall be paid monthly by the county treasurer on the order of the county board of education.