It shall be the duty of the county treasurer to keep the interest and sinking fund account of the county separate and distinct, and when there are sufficient funds in his hands to the credit of the redemption fund to pay in full the principal and interest of any such bonds issued under this article by any such county, to immediately call in and pay as many of such bonds, with accrued interest thereon, as such funds in hand will liquidate, as hereinbefore provided. Such bonds shall be paid in the order of their number, and when it is desired to redeem any of such bonds the county treasurer shall cause to be published for thirty days in some newspaper at or nearest the county seat, a notice stating that certain county bonds by numbers and amounts will be paid on presentation, and that at the expiration of thirty days such bonds will cease to bear interest, and when any bonds or coupons issued under this article are redeemed, it shall be the duty of such treasurer to certify his action to the board of county commissioners, who shall cancel the bonds by punching holes through all the signatures of the bonds and coupons, so that they can be plainly identified, and cause record to be made of the same.