=KROHNKE, G. H. A., Handbook for Laying out Curves on Railways and Tramways.= Crown 8vo, 5_s._ =Lathe, The, and its Uses=; or, Instruction in the Art of Turning Wood and Metal. Sixth Edition. Illustrated. 8vo, 10_s._ 6_d._ =LAWLOR, J. J., Practical Hot Water Heating, Steam and Gas Fitting.= Crown 8vo, 8_s._ 6_d._ =LEFFMANN, HENRY=, and =BEAM, W., Examination of Water for Sanitary and Technical Purposes.= Second Edition, Revised and Enlarged. With Illustrations. Crown 8vo, 5_s._ =Analysis of Milk and Milk Products.= Crown 8vo, 5_s._ =LUKIN, J., Amongst Machines.= A Description of Various Mechanical Appliances used in the Manufacture of Wood, Metal, etc. A book for boys. Third Edition. With 64 Engravings. Crown 8vo, 3_s._ 6_d._ =The Boy Engineers.= What They Did, and How They Did It. A book for boys. With 30 Engravings. Third Edition. Crown 8vo, 3_s._ 6_d._ =The Young Mechanic.= A Book for Boys, containing Directions for the Use of all kinds of Tools, and for the Construction of Steam Engines and Mechanical Models. Seventh Edition. With 70 Engravings. Crown 8vo, 3_s._ 6_d._ =MAGUIRE, W. R., Domestic Sanitary Drainage and Plumbing. Second Edition.= Revised. 8vo, 12_s._ =MALDEN, W. J., Pig Keeping for Profit.= Crown 8vo, 2_s._ 6_d._ (_Village Library._) =MOORE, CUNNINGHAM WILSON, A Practical Guide for Prospectors, Explorers, and Miners.= 8vo, 12_s._ net. =MORFIT, CAMPBELL, Pure Fertilisers, and the Chemical Conversion of Rock Guanos, etc., into various valuable products.= 8vo, £4 4_s._ =Manufacture of Soaps.= With Illustrations. 8vo, £2 12_s._ 6_d._ =OSTERBERG, MAX, Synopsis of Current Electrical Literature.= 8vo, 5_s._ net. =RICHARDSON, M. T., Practical Blacksmithing.= With 400 Illustrations. 4 vols. Crown 8vo, 5_s._ each. =Practical Carriage Building.= 2 vols. 10_s._ =Practical Horse-shoer.= With 170 Illustrations. Crown 8vo, 5_s._ =ROSS, Lieut.-Col. W. A., Pyrology=; or, Fire Chemistry. Small 4to, 36_s._ =SCHEIDEL, Dr. A., The Cyanide Process=; its Practical Applications and Economical Results. 8vo, 6_s._ =SCHOOLING, J. HOLT, Handwriting and Expression.= A Study of Written Gesture, with 150 _Fac-simile_ Reproductions of the Handwritings of Men and Women of various Nationalities. Translated. 8vo, 6_s._ =SCHÜTZENBERGER, Prof., Fermentation.= With 28 Illustrations. Fourth Edition. Crown 8vo, 5_s._ (_I. S. S._) =Science.= Weekly. £1 2_s._ =Scientific American.= Weekly. 18_s._ =Scientific American.= Export Edition. Monthly. £1 5_s._ =Scientific American.= Building Edition. Monthly. 14_s._ =Do. Supplement.= Weekly. £1 5_s._ =SEDDING, J. D., Art and Handicraft.= Six Essays. 8vo, 7_s._ 6_d._ =SMITH, HAMILTON, Hydraulics.= The Flow of Water through Orifices, over Weirs, and through Open Conduits and Pipes. With 17 Plates. Royal 4to, 30_s._ =THURSTON, Prof. R. H., History of the Growth of the Steam Engine.= With Numerous Illustrations. Fourth Edition. Crown 8vo, 5_s._ (_I. S. S._)