When an offer to purchase any particular tract of original grant land has been made to the board of university and school lands, the commissioner shall request the county board of appraisers to appraise such tract. Upon receipt of such request by the county auditor, the auditor shall immediately notify the members of the county board of appraisers, who shall, within ten days, proceed to view and appraise such tract. There is appropriated annually the amounts necessary to pay all expenses under this section. Each payment must be made from the trust fund for which the land is held.