_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_. _The Gas Analyst’s Manual._ By F. W. HARTLEY, Assoc. Inst. C.E., etc. _With numerous illustrations._ Crown 8vo, cloth, 6_s._ _Gas Measurement and Gas Meter Testing._ By F. W. HARTLEY. Fourth edition, revised and extended. _Illustrated_, crown 8vo, cloth, 4_s._ _The French-Polishers 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. _Practical Geometry and Engineering Drawing_; a Course of Descriptive Geometry adapted to the Requirements of the Engineering Draughtsman, including the determination of cast shadows and Isometric Projection, each chapter being followed by numerous examples; to which are added rules for Shading, Shade-lining, etc., together with practical instructions as to the Lining, Colouring, Printing, and general treatment of Engineering Drawings, with a chapter on drawing Instruments. By GEORGE S. CLARKE, Lieut. R.E., Instructor in Mechanical Drawing, Royal Indian Engineering College. 20 _plates_, 4to, cloth, 15_s._