Letter from the Acting Secretary of the Treasury, transmitting copy of a communication of the Secretary of the Interior submitting supplemental estimates of appropriation for the fiscal year 1916 for continuing the construction of the Blackfeet, Flathead, and Fort Peck irrigation projects in Montana, and for the second installment on account of the storage water right provided in the Indian Appropriation Act approved August 1, 1914 (38 Stat., p. 605), for the irrigation of Indian allotments and the Yakima Indian Reservation in the State of Washington.