17. The Cherokee Nation cedes to the United States, in trust to be surveyed, appraised, and sold for the benefit of that nation, the tract of 800,000 acres sold to them by the United States by article 2, treaty of 1835, and the strip of land ceded to the nation by article 4, treaty of 1835, lying within the State of Kansas, and consents that said lands may be included in the limits and jurisdiction of said State. The appraisement shall not average less than $1.25 per acre, exclusive of improvements. The Secretary of the Interior shall, after due advertisement for sealed bids, sell such lands to the highest bidders for cash in tracts of not exceeding 160 acres each at not less than the appraised value. Settlers having improvements to the value of $50 or more on any of the lands not mineral and occupied for agricultural purposes at the date of the signing of this treaty, shall, after due proof under rules to be prescribed by the Secretary of the Interior, be allowed to purchase at the appraised value the smallest quantity of land to include their improvements, not exceeding 160 acres each. The expenses of survey and appraisement shall be paid out of the proceeds of the sale of the lands, and nothing herein shall prevent the Secretary of the Interior from selling to any responsible party for cash all of the unoccupied portion of these lands in a body, for not less than $800,000. 18. Any lands owned by the Cherokees in Arkansas or in States east of the Mississippi River may be sold by their national council, upon the approval of the Secretary of the Interior. 19. All Cherokees residing on the ceded lands desiring to remove to the Cherokee country proper shall be paid by the purchasers the appraised value of their improvements. Such Cherokees desiring to remain on the lands so occupied by them shall be entitled to a patent in fee simple for 320 acres each, to include their improvements, and shall thereupon cease to be members of the nation. 20. Whenever the Cherokee national council shall so request, the Secretary of the Interior shall cause the country reserved for the Cherokees to be surveyed and allotted among them at the expense of the United States. 21. The United States shall at its own expense cause to be run and marked the boundary line between the Cherokee Nation and the States of Arkansas, Missouri, and Kansas as far west as the Arkansas River, by two commissioners, one of whom shall be designated by the Cherokee national council. 22. The Cherokee national council shall have the privilege of appointing an agent to examine the accounts of the nation with the United States, who shall have free access to all the accounts and books in the Executive Departments relating to the business of the Cherokees.