SEC. 3. That alcohol of the required proof may be drawn off, for de-naturation only, from receiving cisterns in the cistern room of any distillery for transfer by pipes direct to any de-naturing bonded warehouse on the distillery premises or to closed metal storage tanks situated in the distillery bonded warehouse, or from such storage tanks to any denaturing bonded warehouse on the distillery premises, and de-natured alcohol may also be transported from the de-naturing bonded warehouse, in such manner and by means of such packages, tanks or tank cars, and on the execution of such bonds, and under such regulations as the Commissioner of Internal Revenue, with the approval of the Secretary of the Treasury, may prescribe. And further, alcohol to be de-natured may be withdrawn without the payment of internal-revenue tax from the distillery bonded warehouse for shipment to central de-naturing plants in such packages, tanks and tank cars, under such regulations, and on the execution of such bonds as may be prescribed by the Commissioner of Internal Revenue, with the approval of the Secretary of the Treasury. SEC. 4. That at distilleries producing alcohol from any substance what ever, for de-naturation only, and having a daily spirit-producing capacity of not exceeding one hundred proof gallons, the use of cisterns or tanks of such size and construction as may be deemed expedient may be permitted in lieu of distillery bonded warehouses, and the production, storage, the manner and process of de-naturing on the distillery premises the alcohol produced, and transportation of such alcohol, and the operation of such distilleries shall be upon the execution of such bonds and under such regulations as the Commissioner of Internal Revenue, with the approval of the Secretary of the Treasury, may prescribe, and such distilleries may by such regulations be exempted from such provisions of the existing laws relating to distilleries as may be deemed expedient by said officials. SEC. 5. That the provisions of this Act shall take effect on September first, nineteen hundred and seven. Approved, March 2, 1907. INDEX. Adam's Still, 38 faults of, 39 operation of, 38 Air necessary to fermentation, 18 cooling for mashes, 15 Alcohol, absolute, 2 as fuel, 221 boiling point of, 2 points of mixture, 2 composition of, 1, 6 contraction in mixtures of, 4 de-natured, 143 determination of purity, 186, 188 estimation of, 179 estimating by Geisler's method, 183 Brand's method, 184 sugar in "Beer", 185 ethyl, 7 methyl, 7 measuring in mixtures, 174, 179 by hydrometers, 176, 178 proof, 175 rectification of, 82, 92 relative amounts in different grains, 126 specific gravity of, 2, 174 strengthening, 31 under proof, 176 wood, 7 Alcoholometer, Cartier's, 178 Field's, 182 Tralle's, 179 Alcoholometry, 174