Section 14
SEC. 14. All bids must be sealed and addressed to the Chief of the Bureau of Public Lands, and must have inclosed therewith a certified check or a post-office money order payable to his order, for twenty-five per centum of the amount of the bid, which amount shall be retained, in case the bid is accepted, as part payment of the purchase price: Provided, That no bids shall be considered which are for less than the appraised value of the land.