Letter from the Secretary of the Treasury, transmitting an estimate of appropriation in the sum of $292,000 for the enforcement of the provisions of the act of December 17, 1914, entitled "an act to provide for the registration of, with collectors of internal revenue, and to impose a special tax upon all persons who produce, import, manufacture, compound, deal in, dispense, sell, distribute, or give away opium or coca leaves, their salts, derivatives, and preparations, and for other purposes."