Section 16
SEC. 16. If at any time before the expiration of the period allowed by law for the making of final proof, it shall be proved to the satisfaction of the Director of Lands, after due notice to the homesteader that the land entered is not under the law subject to homestead entry, or that the homesteader has actually changed his residence, or voluntarily abandoned the land for more than six months at any one time during the years of residence and occupation herein required, or has otherwise failed to comply with the requirements of this Act, the Director of Lands may cancel the entry.