One of their number shall, from time to time, be appointed by the said commissioners treasurer of said board of police; and his appointment, when made, shall be certified to by the clerk of the circuit court of the judicial circuit in which said cities shall be located, under the seal of said court. Said treasurer shall hold his office for such time as may be designated by the commissioners, who may remove him at pleasure. Before he enters upon the duties of his office as treasurer, he shall give bond to the state of Missouri, with one or more sureties, in the penalty of ten thousand dollars, conditioned for the faithful discharge of his duties as treasurer of the board of police, and for the faithful application and payment over, pursuant to the order and direction of said board, of all moneys which may come to his hands as such treasurer. The bond of the treasurer shall be approved by a circuit judge of the judicial circuit in which said cities shall be located and shall be delivered to and safely kept by the treasurer of said cities.