_A Practical Treatise on Natural and Artificial Concrete, its Varieties and Constructive Adaptations._ By HENRY REID, Author of the ‘Science and Art of the Manufacture of Portland Cement.’ New Edition, _with 59 woodcuts and 5 plates_, 8vo, cloth, 15_s._ _Hydrodynamics_: Treatise relative to the Testing of Water-Wheels and Machinery, with various other matters pertaining to Hydrodynamics. By JAMES EMERSON. _With numerous illustrations_, 360 pp. Third edition, crown 8vo, cloth, 4_s._ 6_d._ _Electricity as a Motive Power._ By Count TH. DU MONCEL, Membre de l’Institut de France, and FRANK GERALDY, Ingénieur des Ponts et Chaussées. Translated and Edited, with Additions, by C. J. WHARTON, Assoc. Soc. Tel. Eng. and Elec. _With 113 engravings and diagrams_, crown 8vo, cloth, 7_s._ 6_d._ _Hints on Architectural Draughtsmanship._ By G. W. TUXFORD HALLATT. Fcap. 8vo, cloth, 1_s._ 6_d._ _Treatise on Valve-Gears_, with special consideration of the Link-Motions of Locomotive Engines. By Dr. GUSTAV ZEUNER, Professor of Applied Mechanics at the Confederated Polytechnikum of Zurich. Translated from the Fourth German Edition, by Professor J. F. KLEIN, Lehigh University, Bethlehem, Pa. _Illustrated_, 8vo, cloth, 12_s._ 6_d._ _The French-Polisher’s Manual._ By a French-Polisher; containing Timber Staining, Washing, Matching, Improving, Painting, Imitations, Directions for Staining, Sizing, Embodying, Smoothing, Spirit Varnishing, French-Polishing, Directions for Repolishing. Third edition, royal 32mo, sewed, 6_d._ _Hops, their Cultivation, Commerce, and Uses in various Countries._ By P. L. SIMMONDS. Crown 8vo, cloth, 4_s._ 6_d._ _A Practical Treatise on the Manufacture and Distribution of Coal Gas._ By WILLIAM RICHARDS. Demy 4to, with _numerous wood engravings and 29 plates_, cloth, 28_s._ SYNOPSIS OF CONTENTS: Introduction—History of Gas Lighting—Chemistry of Gas Manufacture, by Lewis Thompson, Esq., M.R.C.S.—Coal, with Analyses, by J. Paterson, Lewis Thompson, and G. R. Hislop, Esqrs.—Retorts, Iron and Clay—Retort Setting—Hydraulic Main—Condensers—Exhausters—Washers and Scrubbers—Purifiers—Purification—History of Gas Holder—Tanks, Brick and Stone, Composite, Concrete, Cast-iron, Compound Annular Wrought-iron—Specifications—Gas Holders—Station Meter—Governor—Distribution—Mains—Gas Mathematics, or Formulæ for the Distribution of Gas, by Lewis Thompson, Esq.—Services—Consumers’ Meters—Regulators—Burners—Fittings—Photometer—Carburization of Gas—Air Gas and Water Gas—Composition of Coal Gas, by Lewis Thompson, Esq.—Analyses of Gas—Influence of Atmospheric Pressure and Temperature on Gas—Residual Products—Appendix—Description of Retort Settings, Buildings, etc., etc.