Supplemental estimate of appropriation -- Quartermaster Corps. Letter from the Secretary of the Treasury, transmitting a copy of a communication from the Acting Secretary of War, submitting a supplemental estimate of appropriation in the sum of $2,500,000, required by the Quartermaster Corps for mileage to officers and contract surgeons, fiscal year 1918, being additional to estimate of $3,000,000 for this object transmitted to Congress December 31, 1917.