PHOTOGRAPHY. By Captain W. De Wiveleslie Abney, C.B. F.R.S. late Instructor in Chemistry and Photography at the School of Military Engineering, Chatham. With 105 Woodcuts. Price 3s. 6d.

The STRENGTH of MATERIALS and STRUCTURES; the Strength of Materials as depending on their quality and as ascertained by Testing Apparatus; the Strength of Structures as depending on their form and arrangement, and on the materials of which they are composed. By Sir J. Anderson, C.E. &c. With 66 Woodcuts. Price 3s. 6d.

INTRODUCTION to the STUDY of ORGANIC CHEMISTRY; the CHEMISTRY of CARBON and its COMPOUNDS. By Henry E. Armstrong Ph.D. F.R.S. With 8 Woodcuts. Price 3s. 6d.

ELEMENTS of ASTRONOMY. By Sir R. S. Ball, LL.D. F.R.S. Andrews Professor of Astronomy in the Univ. of Dublin, Royal Astronomer of Ireland. With 136 Woodcuts. Price 6s.

RAILWAY APPLIANCES. A Description of Details of Railway Construction subsequent to the completion of Earthworks and Structures, including a short Notice of Railway Rolling Stock. By John Wolfe Barry, M.I.C.E. With 207 Woodcuts. Price 3s. 6d.

SYSTEMATIC MINERALOGY. By Hilary Bauerman, F.G.S. Associate of the Royal School of Mines. With 373 Woodcuts. Price 6s.

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METALS, their PROPERTIES and TREATMENT. By C. L. Bloxam and A. K. Huntington, Professors in King's College, London. With 130 Woodcuts. Price 5s.

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PHYSICAL OPTICS. By R. T. Glazebrook, M.A. F.R.S. Fellow and Lecturer of Trin. Coll. Demonstrator of Physics at the Cavendish Laboratory, Cambridge. With 183 Woodcuts. Price 6s.

The ART of ELECTRO-METALLURGY, including all known Processes of Electro-Deposition. By G. Gore, LL.D. F.R.S. With 56 Woodcuts. Price 6s.

ALGEBRA and TRIGONOMETRY. By William Nathaniel Griffin, B.D. Price 3s. 6d. NOTES ON, with SOLUTIONS of the more difficult QUESTIONS. Price 3s. 6d.

The STEAM ENGINE. By George C. V. Holmes, Whitworth Scholar; Secretary of the Institution of Naval Architects, With 212 Woodcuts. Price 6s.

ELECTRICITY and MAGNETISM. By Fleeming Jenkin, F.R.SS. L. & E. late Professor of Engineering in the University of Edinburgh. With 177 Woodcuts. Price 3s. 6d.

THEORY of HEAT. By J. Clerk Maxwell, M.A. LL.D. Edin. F.R.SS. L. & E. With 41 Woodcuts. Price 3s. 6d.

TECHNICAL ARITHMETIC and MENSURATION. By Charles W. Merrifield, F.R.S. Price 3s. 6d. Key, by the Rev. John Hunter, M.A. Price 3s. 6d.

INTRODUCTION to the STUDY of INORGANIC CHEMISTRY. By William Allen Miller, M.D. LL.D. F.R.S. With 72 Woodcuts. Price 3s. 6d.

TELEGRAPHY. By W. H. Preece, F.R.S. M.I.C.E, and J. Sivewright, M.A. C.M.G. With 160 Woodcuts. Price 5s.

The STUDY of ROCKS, an ELEMENTARY Text-Book of PETROLOGY. By Frank Rutley, F.G.S. of Her Majesty's Geological Survey. With 6 Plates and 88 Woodcuts. Price 4s. 6d.

WORKSHOP APPLIANCES, including Descriptions of some of the Gauging and Measuring Instruments—Hand-Cutting Tools, Lathes, Drilling, Planing, and other Machine Tools used by Engineers. By C. P. B. Shelley, M.I.C.E. With 291 Woodcuts. Price 4s. 6d.

STRUCTURAL and PHYSIOLOGICAL BOTANY. By Dr. Otto Wilhelm ThomÉ, Rector of the High School, Cologne, and A. W. Bennett, M.A. B.Sc. F.L.S. With 600 Woodcuts and a Coloured Map. Price 6s.

QUANTITATIVE CHEMICAL ANALYSIS. By T. E. Thorpe, F.R.S. Ph.D. Professor of Chemistry in the Andersonian University, Glasgow. With 88 Woodcuts. Price 4s. 6d.

QUALITATIVE ANALYSIS and LABORATORY PRACTICE. By T. E. Thorpe, Ph.D. F.R.S. Professor of Chemistry in the Andersonian University, Glasgow, and M. M. PATTISON MUIR, M.A. and F.R.S.E. With Plate of Spectra and 57 Woodcuts. Price 3s. 6d.

INTRODUCTION to the STUDY of CHEMICAL PHILOSOPHY; the PRINCIPLES of THEORETICAL and SYSTEMATICAL CHEMISTRY. By William A. Tilden, D.Sc. London, F.R.S. With 5 Woodcuts. With or without Answers to Problems, 4s. 6d.

ELEMENTS of MACHINE DESIGN; an Introduction to the Principles which determine the Arrangement and Proportion of the Parts of Machines, and a Collection of Rules for Machine Design. By W. Cawthorne Unwin, B.Sc. M.I.C.E. With 325 Woodcuts. Price 6s.

PLANE and SOLID GEOMETRY. By H. W. Watson, M.A. formerly Fellow of Trinity College, Cambridge. Price 3s. 6d.