Section 29
SEC. 29. After title has been granted, the purchaser may not, within a period of ten years from such cultivation or grant, convey or encumber or dispose said lands or rights thereon to any person, corporation or association, without prejudice to any right or interest of the Government in the land: Provided, That any sale and encumbrance made in violation of the provisions of this section, shall be null and void and shall produce the effect of annulling the acquisition and reverting the property and all rights thereto to the State, and all payments on the purchase price theretofore made to the Government shall be forfeited.