Preservation of American antiquities. Letter from the Secretary of the Treasury, transmitting copy of a communication of the Secretary of the Interior of the 15th instant, submitting a supplemental estimate of appropriation in the sum of $5,000, for the preservation, development, administration and protection of the national monuments created under the provisions of the act of June 8, 1906 (34 Stat., 225), entitled "an act for the preservation of American antiquities."