Within ten days after receiving a certificate of the order appointing him to the office specified in the first* section of this act, and after his confirmation by the county board as provided herein, it shall be the duty of such person to file with the district clerk of his county a bond, with at least two sufficient sureties, in the sum of three thousand dollars, to the proper county, conditioned that he will faithfully perform the duties of his office, which bond and sureties thereon shall be approved by the district court of the proper county, which approval shall be made part of the records of said court: Provided, That a bond conditioned as hereinbefore recited, and executed by a bonding company authorized to do business under the laws of this state, shall, upon approval of the board of county commissioners, be construed to be and constitute sufficient surety.