The treasurer shall pay the interest on the bonds authorized to be issued by this chapter, on presentation of matured coupons therefor, out of the funds of the district in his or her hands. Whenever there shall be sufficient money in any such fund (not less than one thousand dollars) over and above sufficient for the payment of matured interest on all outstanding bonds, to pay the principal of one or more bonds, the treasurer shall call in and pay the bonds in their numerical order: PROVIDED, That the call for bonds shall be made by publication in the official newspaper of the county within five days after the semiannual interest period, and shall state that bonds numbered . . . . . . . . . (giving the serial numbers of the bonds called) will be paid on presentation; and that after a date named, not more than fifteen days thereafter, interest on the bonds called shall cease.