WORKS BY JOHN TYNDALL,

D.C.L., LL.D., F.R.S.

Fragments of Science: a Series of Detached Essays, Addresses and Reviews. 2 vols. Crown 8vo. 168.

VOL. I. :-The Constitution of Nature-Radiation-On Radiant Heat in relation to the Colour and Chemical Constitution of Bodies-New Chemical Reactions produced by Light -On Dust and Disease-Voyage to Algeria to observe the Eclipse-Niagara-The Parallel Roads of Glen Roy-Alpine Sculpture-Recent Experiments on Fog-Signals-On the Study of Physics-On Crystalline and Slaty Cleavage-On Paramagnetic and Diamagnetic Forces -Physical Basis of Solar Chemistry-Elementary Magnetism-On Force-Contributions to Molecular Physics-Life and Letters of FARADAY-The Copley Medalist of 1870-The Copley Medalist of 1871-Death by Lightning.-Science and the Spirits.

VOL. II. :-Reflections on Prayer and Natural Law-Miracles and Special ProvidencesOn Prayer as a Form of Physical Energy-Vitality-Matter and Force-Scientific Materialism-An Address to Students-Scientific Use of the Imagination-The Belfast AddressApology for the Belfast Address-The Rev. JAMES MARTINEAU and the Belfast AddressFermentation, and its Bearings on Surgery and Medicine-Spontaneous GenerationScience and Man-Professor VIRCHOW and Evolution-The Electric Light.

New Fragments. Crown 8vo. 10s. 6d.

CONTENTS:-The Sabbath-Goethe's 'Farbenlehre-Atoms, Molecules and Ether Waves -Count Rumford-Louis Pasteur, his Life and Labours-The Rainbow and its CongenersAddress delivered at the Birkbeck Institution on 22nd October, 1884-Thomas Young-Life in the Alps-About Common Water-Personal Recollections of Thomas Carlyle-On Unveiling the Statue of Thomas Carlyle-On the Origin, Propagation and Prevention of Phthisis Old Alpine Jottings-A Morning on Alp Lusgen.

13

Scientific Works published by Longmans, Green, & Co. ENGINEERING, STRENGTH OF MATERIALS, &c. ANDERSON The Strength of Materials and Structures: the Strength of Materials as depending on their Quality and as ascertained by Testing Apparatus. By Sir J. ANDERSON, C.E., LL.D., F.R.S.É. With 66 Woodcuts. Fep. 8vo. 3s. 6d. BARRY-Railway Appliances: a Description of Details of Railway Construction subsequent to the Completion of the Earthworks and Structures. By JOHN WOLFE BARRY, C.B., M.I.C.E. With 218 Woodcuts. Fcp. 8vo. 4s. 6d. STONEY-The Theory of the Stresses on Girders and Similar Structures. With Practical Observations on the Strength and other Properties of Materials. By BINDON B. STONEY, LL.D., F.R.S., M.I.C.E. With 5 Plates and 143 Illustrations in the Text. Royal 8vo. 368. UNWIN-Works by W. CAWTHORNE UNWIN, B.Sc., M. Inst. Civil Engineers.

The Testing of Materials of Construction. Embracing the Description of Testing Machinery and Apparatus Auxiliary to Mechanical Testing, and an Account of the most Important Researches on the Strength of Materials. With 141 Woodcuts and 5 folding-out Plates. 8vo. 21s.

On the Development and Transmission of Power from Central Stations being the Howard Lectures delivered at the Society of Arts in 1893. With 81 Diagrams. 8vo. 10s. net. WARREN—Engineering Construction in Iron, Steel, and Timber. By WILLIAM HENRY WARREN, Whitworth Scholar; Member of the Institution of Civil Engineers, London; Challis Professor of Civil and Mechanical Engineering, University of Sydney. With 13 Folding Plates and 375 Diagrams. Royal 8vo.

168. net.

LONGMANS' CIVIL ENGINEERING SERIES.

Edited by the Author of 'Notes on Building Construction'.

Tidal Rivers: their Hydraulics, Improvement and Navigation. By W.
H. WHEELER, M.Inst.C.E., Author of The Drainage of Fens and
Low Lands by Gravitation and Steam Power'. With 75 Illustrations.
Medium 8vo. 168. net.
[Ready.
Notes on Docks and Dock Construction. By C. COLSON, M. Inst.C.E.,
Assistant Director of Works, Admiralty. With 365 Illustrations.

Medium 8vo. 21s. net.
Principle and Practice of Harbour Construction. By WILLIAM SHIELD,
F.R.S.E., M.Inst.C.E., and Executive Engineer, Natural Harbour Ref-
uge, Peterhead, N.B. With 97 Illustrations. Medium 8vo. 15s. net.
Railway Construction. By W. H. MILLS, M.Inst.C.E., Engineer-in-Chief,
Great Northern Railway, Ireland.
[In preparation.
Calculations for Engineering Structures. By T. CLAXTON FIDLER,
M.Inst.C.E., Professor of Engineering in the University of Dundee;
Author of A Practical Treatise on Bridge Construction'. [În preparation.
The Student's Course of Civil Engineering. By L. F. VERNON-
HARCOURT, M. Inst.C.E., Professor of Civil Engineering at University
College.
[In preparation.

WORKSHOP APPLIANCES, &c.

NORTHCOTT-Lathes and Turning, Simple, Mechanical and Ornamental. By W. H. NORTHCOTT. With 338 Illustrations. 8vo. 18s. SHELLEY-Workshop Appliances, including Descriptious 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 323 Woodcuts. Fep. 8vo. 5s.

MINERALOGY, METALLURGY, &c.

BAUERMAN—Works by HILARY BAUERMAN, F.G.S.

Systematic Mineralogy. With 373 Woodcuts and Diagrams. Fcp. 8vo. 68.

Descriptive Mineralogy. With 236 Woodcuts and Diagrams. Fcp. 8vo.

68.

BLOXAM and HUNTINGTON-Metals: their Properties and Treatment. By C. L. BLOXAM and A. K. HUNTINGTON, Professors in King's College, London. With 130 Woodcuts. Fcp. 8vo. 5s.

GORE-The Art of Electro-Metallurgy, including all known Processes of Electro-Deposition. By G. GORE, LL.D., F.R.S. With 56 Woodcuts. Fcp. 8vo. 68.

LUPTON-Mining. An Elementary Treatise on the Getting of Minerals. By ARNOLD LUPTON, M.I.C.E., F.G.S., etc., Mining Engineer, Professor of Coal Mining at the Victoria University, Yorkshire College, Leeds. With 596 Illustrations. Crown 8vo. 9s. net.

MITCHELL-A Manual of Practical Assaying. By JOHN MITCHELL, F.C.S. Revised, with the Recent Discoveries incorporated. By W. CROOKES, F.R.S. With 201 Illustrations. 8vo. 31s. 6d.

RHEAD-Metallurgy. An Elementary Text-Book. By E. C. RHEAD, Lecturer on Metallurgy at the Municipal Technical School, Manchester. With 94 Illustrations. Crown 8vo. 3s. 6d.

RUTLEY The Study of Rocks; an Elementary Text-Book of Petrology. By F. RUTLEY, F.G.S. With 6 Plates and 88 Woodcuts. Fcp. 8vo. 48. 6d.

VON COTTA-Rocks Classified and Described: A Treatise on Lithology. By BERNHARD VON COTTA. With English, German, and French Synonyms. Translated by PHILIP HENRY LAWRENCE, F.G.S., F.R.G.S. Crown 8vo. 148.

Scientific Works published by Longmans, Green, & Co. 15

MACHINE DRAWING AND DESIGN.

LOW and BEVIS-A Manual of Machine Drawing and Design. By DAVID ALLAN Low (Whitworth Scholar), M.I. Mech. E., Headmaster of the Technical School, People's Palace, London; and ALFRED WILLIAM BEVIS (Whitworth Scholar), M.I. Mech. E., Director of Manual Training to the Birmingham School Board. With over 700 Illustrations. 8vo. 78. 6d.

LOW--Improved Drawing Scales. By DAVID ALLAN LOW. 4d. in case.

An Introduction to Machine Drawing and Design. By DAVID ALLAN LOW, Headmaster of the Technical School, People's Palace, London. With 97 Illustrations and Diagrams. Crown 8vo. 28. UNWIN-The Elements of Machine Design. By W. CAWTHORNE UNWIN, F.R.S., Part I. General Principles, Fastenings and Transmissive Machinery. With 304 Diagrams, &c. Crown 8vo. 6s. Part II. Chiefly on Engine Details. With 174 Woodcuts. Crown 8vo. 48. 6d.

ASTRONOMY, NAVIGATION, &c.

ABBOTT Elementary Theory of the Tides: the Fundamental Theorems Demonstrated without Mathematics, and the Influence on the Length of the Day Discussed. By T. K. ABBOTT, B.D., Fellow and Tutor, Trinity College, Dublin. Crown 8vo. 28.

BALL—Works by Sir ROBERT S. BALL, LL.D., F.R.S.

Elements of Astronomy. With 136 Diagrams. Fcp. 8vo. 68. A Class-Book of Astronomy. With 41 Diagrams. Fcp. 8vo. 1s. 6d. BRINKLEY--Astronomy. By F. BRINKLEY, formerly Astronomer Royal for Ireland. Re-edited and Revised by J. W. STUBBS, D.D., and F. BRUNNOW, Ph.D. With 49 Diagrams. Crown 8vo. 68.

CLERKE-The System of the Stars. By AGNES M. CLERKE. With 6 Plates and numerous Illustrations. 8vo. 21s.

GIBSON The Amateur Telescopist's Handbook. By FRANK M. GIBSON, Ph.D., LL.B. With 1 Plate and 13 Diagrams. Čr. 8vo. 3s. 6d. HERSCHEL-Outlines of Astronomy. By Sir JOHN F. W. HERSCHEL, Bart., K.H., &c. With 9 Plates and numerous Diagrams. Crown 8vo. 12s. MARTIN-Navigation and Nautical Astronomy. Compiled by StaffCommander W. R. MARTIN, R.N. Royal 8vo. 188.

MERRIFIELD-A Treatise on Navigation for the use of Students. By JOHN MERRIFIELD, LL.D., F.R.A.S., F.M.S. Crown 8vo. 5s. WEBB-Celestial Objects for Common Telescopes. By the Rev. T. W. WEBB, M.A., F.R.A.S. Fifth Edition, Revised and greatly Enlarged, by the Rev. T. E. ESPIN, M.A., F.R.A.S. (2 vols.) Vol. I.. with 2 Plates and numerous Illustrations. Crown 8vo. 6s. Vol. II., with Illustrations and Map of Star Spectra. Crown 8vo. 68. 6d.