Section 3
SEC. 3. Section thirty-seven of Act Numbered Twenty-eight hundred and seventy-four, as amended by section nine of Act Numbered Thirty-five hundred and seventeen, is hereby further amended so as to read as follows: “SEC. 37. Leases shall run for a period of not more than twenty-five years, but may be renewed once for another period of not to exceed twenty-five years, in case the lessee shall have made important improvements which, in the opinion of the Secretary of Agriculture and Commerce, justify a renewal. Upon the final expiration of the lease, all buildings and other permanent improvements made by the lessee, his heirs, executors, administrators, successors, or assigns shall have become the property of the Government, and the land together with the said improvements shall be disposed of in accordance with the provisions of chapter five of this Act. It shall be an inherent and essential condition of the lease that the lessee shall have not less than one-third of the land broken and cultivated within five years after the date of the approval of the lease and shall not assign, encumber, or sublet his rights without the consent of the Secretary of Agriculture and Commerce, and that the violation of this condition shall avoid the contract: Provided, That assignment, encumbrance, or subletting for purposes of speculation shall not be permitted in any case: Provided, further, That nothing contained in this section shall be understood or construed to permit the assignment, encumbrance, or subletting of lands leased under this Act or under the former Public Land Act, to persons, corporations, or associations which under this Act, are not authorized to lease public lands."