Sec. 12. EXPENSES OF COUNTY SUPERINTENDENT. It shall be the duty of the Commissioners' Court as soon as this Act shall become effective, on a written order of the County Board of Education, to pay from the general fund of the county to the County Superintendent not less than $600.00 nor more than $800.00 per annum in equal monthly payments for stamps, stationery, express, printing and all other expenses incidental and necessary in the administration of his office. The County Board of Education shall have the authority to fix the amount to be paid for the expenses of the County Superintendent as provided for in this Act and shall notify the Commissioners' Court of the amount to be paid not later than August 1st of each year.