Sec. 3. The salary and traveling expenses provided for herein shall be paid monthly, upon the order of fhe County Board of Education; provided that the salary for the month of September shall not be paid until the said county superintendent submits a certificate from the State Superintendent of Public Instruction showing that all reports required have been made to the State Department of Education; that the office expenses provided herein shall be paid by the County Treasurer on the order of the Commissioners Court as said expenses may be incurred.