The county of Boone is bounded as follows: Commencing at the southwest corner of township eighteen, north, of range eight, west; thence east along the northern boundary of the Pawnee reservation, to a point where the dividing line between ranges four and five, west, intersect the same; thence north to the northeast corner of township twenty-two, north, of range five, west; thence west to the northwest corner of township twenty-two, north, of range eight, west; thence south to the place of beginning.