Only one person upon a quarter-section is protected, and he the one who made the first settlement, provided he conform to the other provisions of the law. A person who has once availed himself of the provisions of the Pre-emption Act, cannot, at any future period, or at any other land office, acquire any other right under it. No person, who is the proprietor of three hundred and twenty acres of land in any State or Territory of the United States, or who quits or abandons his residence on his own land to reside on the public land in the same State or Territory, is entitled to the benefit of the Pre-emption Acts. The approval of the tracts by the local land office is the evidence of the survey; but the land is to be construed as surveyed when the requisite lines are run on the field, and the corners established by the deputy surveyor. No assignment or transfers of pre-emption rights are recognized at the land office; the patents issuing to the claimants, in whose names alone the entries are made. The following description of lands are not liable to entry: _first_, lands included in any reservation by any treaty, law, or proclamation of the President of the United States, and lands reserved for salines and for other purposes; _second_, lands reserved for the support of schools; _third_, lands acquired by either of the last two treaties with the Miami Indians in Indiana, or which may be acquired of the Wyandot Indians in Ohio, or any other Indian reservation, to which the title has been, or may be extinguished at any time during the operation of the Pre-emption Acts, by the United States; _fourth_, sections of lands reserved to the United States, alternate to other sections granted to any State for the construction of any canal, railroad, or other public improvement; _fifth_, sections, or fractions of sections, included within the limits of any incorporated town; _sixth_, every portion of the public lands which has been selected as a site for a city or town; _seventh_, every parcel or lot of land actually settled and occupied for the purposes of trade and agriculture; and, _eighth_, all lands in which are situated any known salines or mines. Persons claiming the benefit of the Pre-emption Acts are required to file duplicate affidavits, such as are specified by law, and to furnish proof, by one or more disinterested witnesses, of the facts necessary to establish the requisites mentioned in the first paragraph of this article; such witnesses having first been duly sworn or affirmed by some competent authority.