SCIENCE.

(1) Natural Philosophy, (2) Astronomy, (3) Chemistry, (4) Biology, (5) Medicine, (6) Anthropology, (7) Physical Geography and Geology, (8) Agriculture.

NATURAL PHILOSOPHY. Airy. Works by Sir G. B. AIRY, K.C.B., formerly AstronomerRoyal.

ON SOUND AND ATMOSPHERIC VIBRATIONS. With the Mathematical Elements of Music. Designed for the Use of Students in the University. Second Edition, revised and enlarged. Crown 8vo

9s.

A TREATISE ON MAGNETISM.

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Students in the University. Crown 8vo. 9s. 6d. GRAVITATION: an Elementary Explanation of the Principal Perturbations in the Solar System. Second Edition. Crown 8vo. 7s. 6d. Alexander (T.).—ELEMENTARY APPLIED MECHANICS. Being the simpler and more practical Cases of Stress and Strain wrought out individually from first principles by means of Elementary Mathematics. By T. ALEXANDER, C.E., Professor of Civil Engineering in the Imperial College of Engineering, Tokei, Japan. Crown 8vo. Part I. 4s. 6d. Alexander - Thomson. ELEMENTARY APPLIED MECHANICS. By THOMAS ALEXANDER, C.E., Professor of Engineering in the Imperial College of Engineering, Tokei, Japan; and ARTHUR WATSON THOMSON, C.E., B.Sc., Professor of Engineering at the Royal College, Cirencester. Part II. TRANSVERSE STRESS; upwards of 150 Diagrams, and 200 Examples carefully worked out; new and complete method for finding, at every point of a beam, the amount of the greatest bending moment and shearing force during the transit of any set of loads fixed relatively to one another-e.g., the wheels of a locomotive; continuous beams, &c., &c. Crown 8vo. IUS. 6d.

Ball (R. S.).—EXPERIMENTAL MECHANICS. A Course of
Lectures delivered at the Royal College of Science for Ireland.
By Sir R. S. BALL, M.A., Astronomer Royal for Ireland.
Cheaper Issue. Royal 8vo. IOS. 6d.
Bottomley.-FOUR FIGURE MATHEMATICAL TABLES
FOR PHYSICAL CALCULATION. By J. T. BOTTOMLEY,
M. A., F.R.S.E., Demonstrator in Experimental Physics in the
University of Glasgow. 8vo.
[In the press.
Chisholm.

THE SCIENCE OF WEIGHING AND MEASURING, AND THE STANDARDS OF MEASURE AND WEIGHT. By H. W. CHISHOLM, Warden of the Standards. With numerous Illustrations. Crown 8vo. 4s. 6d. (Nature Series).

By R.

Clausius.-MECHANICAL THEORY OF HEAT.
CLAUSIUS. Translated by WALTER R. BROWNE, M.A., late
Fellow of Trinity College, Cambridge. Crown 8vo. IOS. 6d.
Cotterill.-APPLIED MECHANICS: an Elementary General
Introduction to the Theory of Structures and Machines. By
JAMES H. COTTERILL, F.R.S., Associate Member of the Council
of the Institution of Naval Architects, Associate Member of the
Institution of Civil Engineers, Professor of Applied Mechanics in
the Royal Naval College, Greenwich. Medium 8vo. 18s.
Cumming.-AN INTRODUCTION TO THE THEORY OF
ELECTRICITY. By LINNEUS CUMMING, M.A., one of the
Masters of Rugby School. With Illustrations. Crown 8vo.
8s. 6d.
Daniell.-A

TEXT-BOOK OF THE PRINCIPLES OF
PHYSICS. By ALFRED DANIELL, M. A., LL.B., D.Sc.,
F.R.S.E., late Lecturer on Physics in the School of Medicine,
Edinburgh. With Illustrations. Second Edition. Revised and
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2IS.

Day.-ELECTRIC LIGHT ARITHMETIC.

By R. E. DAY, M.A., Evening Lecturer in Experimental Physics at King's College, London. Pott 8vo. 25. Everett.-UNITS AND PHYSICAL CONSTANTS. By J. D. EVERETT, M.A., D.C.L, F.R.S, F.R.S. E., Professor of Natural Philosophy, Queen's College, Belfast. Second Edition. Extra fcap. 8vo. 5s. Gray.-ABSOLUTE MEASUREMENTS IN ELECTRICITY AND MAGNETISM. By ANDREW GRAY, M.A., F.R. S. E., Professor of Physics in the University College of North Wales. Crown 8vo. [New Edition in the press. Grove.-A DICTIONARY OF MUSIC AND MUSICIANS. (A.D. 1450-1886). By Eminent Writers, English and Foreign. Edited by Sir GEORGE GROVE, D.C.L., Director of the Royal College of Music, &c. Demy 8vo.

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"Dr. Grove's Dictionary will be a boon to every intelligent lover of music."— SATURDAY REVIEW.

Huxley.-INTRODUCTORY PRIMER OF SCIENCE. By T. H. HUXLEY, F.R.S., &c. 18mo.

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Ibbetson.-THE MATHEMATICAL THEORY OF PER

FECTLY ELASTIC SOLIDS, with a Short Account of Viscous
Fluids. An Elementary Treatise. By WILLIAM JOHN IBBETSON,
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Jones.-EXAMPLES IN PHYSICS. By D. E. JONES, B.Sc. Lecturer in Physics in University College, Aberystwyth. Fcap. 8vo. [In preparation. Kempe.-HOW TO DRAW A STRAIGHT LINE; a Lecture on Linkages. By A. B. KEMPE. With Illustrations. Crown 8vo. Is. 6d. (Nature Series.)

Kennedy. THE MECHANICS OF MACHINERY. By A. B. W. KENNEDY, M. Inst. C. E., Professor of Engineering and Mechanical Technology in University College, London. With numerous Illustrations. Crown 8vo. 12s. 6d. Lang.-EXPERIMENTAL PHYSICS. By P. R. SCOTT LANG, M. A., Professor of Mathematics in the University of St. Andrews. With Illustrations. Crown 8vo. [In the press. Lupton.-NUMERICAL TABLES AND CONSTANTS IN ELEMENTARY SCIENCE. By SYDNEY LUPTON, M.A,. F.C.S., F.I.C., Assistant Master at Harrow School. Extra fcap. 8vo. 2s. 6d. Macfarlane,-PHYSICAL ARITHMETIC. By ALEXANDER MACFARLANE, D.Sc., Examiner in Mathematics in the University of Edinburgh. Crown 8vo. 7s. 6d. Macgregor.-KINEMATICS AND DYNAMICS. An Elementary Treatise. By J. G. MACGREGOR, M.A., Professor of Physics in Dalhousie College, Halifax, Nova Scotia. With Illustrations. Crown 8vo. [In the press. Mayer.-SOUND: a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the Use of Students of every age. By A. M. MAYER, Professor of Physics in the Stevens Institute of Technology, &c. With numerous 3s. 6d. (Nature Series.) Mayer and Barnard.-LIGHT: a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Light, for the Use of Students of every age. By A. M. MAYER and C. BARNARD. With numerous Illustrations. Crown 8vo. 2s. 6d. (Nature Series.)

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Newton.-PRINCIPIA. Edited by Professor Sir W. THOMSON and Professor BLACKBURNE. 4to, cloth. 31s. 6d.

THE FIRST THREE SECTIONS OF NEWTON'S PRINCIPIA. With Notes and Illustrations. Also a Collection of Problems, principally intended as Examples of Newton's Methods. By PERCIVAL FROST, M.A. Third Edition. 8vo. 125.

Parkinson.-A TREATISE ON OPTICS. By S. PARKINSON, D.D., F.R.S., Tutor and Prælector of St. John's College, Cambridge. Fourth Edition, revised and enlarged. Crown 8vo. 10s. 6d. Perry. STEAM. AN ELEMENTARY TREATISE.

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JOHN PERRY, C.E., Whitworth Scholar, Fellow of the Chemical Society Professor of Mechanical Engineering and Applied Mechanics at the Technical College, Finsbury. With numerous Woodcuts and Numerical Examples and Exercises. 18mo. 4s. 6d. Ramsay. EXPERIMENTAL PROOFS OF CHEMICAL THEORY FOR BEGINNERS. BY WILLIAM RAMSAY, Ph.D., Professor of Chemistry in University College, Bristol. Pott 8vo. 2s. 6d.

Rayleigh. THE THEORY OF SOUND. BY LORD RAYLEIGH, M.A., F.R.S., formerly Fellow of Trinity College, Cambridge, 8vo. Vol. I. 12s. 6d. Vol. II. 12s. 6d. [Vol. III. in the press. Reuleaux.-THE KINEMATICS OF MACHINERY. Outlines of a Theory of Machines. By Professor F. REULEAUX. Translated and Edited by Professor A. B. W. Kennedy, C.E. With 450 Illustrations. Medium 8vo. 21S.

Roscoe and Schuster.-SPECTRUM ANALYSIS. Lectures
delivered in 1868 before the Society of Apothecaries of London.
By Sir HENRY E. ROSCOE, LL.D., F.R.S., formerly Professor of
Chemistry in the Owens College, Victoria University, Manchester.
Fourth Edition, revised and considerably enlarged by the Author
and by ARTHUR SCHUSTER, F. R.S., Ph.D., Professor of Applied
Mathematics in the Owens College, Victoria University.
With Appendices, numerous Illustrations, and Plates. Medium
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Shann.-AN ELEMENTARY TREATISE ON HEAT, IN
RELATION TO STEAM AND THE STEAM-ENGINE.
By G. SHANN, M.A. With Illustrations. Crown Svo. 4s. 6d.
Spottiswoode.-POLARISATION OF LIGHT. By the late
W. SPOTTISWOODE, F.R.S. With many Illustrations. New

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Stewart (Balfour).—Works by BALFOUR STEWART, F.R.S., Professor of Natural Philosophy in the Owens College, Victoria University, Manchester.

PRIMER OF PHYSICS. With numerous Illustrations. New Edition, with Questions. 18mo. IS. (Science Primers.) LESSONS IN ELEMENTARY PHYSICS. With numerous Illustrations and Chromolitho of the Spectra of the Sun, Stars, and Nebulæ. New Edition. Fcap. 8vo. 4s. 6d.

QUESTIONS ON BALFOUR STEWART'S ELEMENTARY LESSONS IN PHYSICS. By Prof. THOMAS H. CORE, Owens College, Manchester. Fcap. 8vo. 2s.

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Stewart and Gee.-ELEMENTARY PRACTICAL PHY-
SICS, LESSONS IN. By Professor BALFOUR STEWART, F.R.S.,
and W. HALDANE GEE, B. Sc.
Part I.-GENERAL PHYSICAL PROCESSES.
Part II.-ELECTRICITY AND MAGNETISM.
Part III.-OPTICS, HEAT, AND SOUND.
A SCHOOL COURSE OF PRACTICAL PHYSICS. By the
same Authors.

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Part I.-ELECTRICITY AND MAGNETISM. [In the press. Stokes.-ON LIGHT. Being the Burnett Lectures, delivered in Aberdeen in 1883-1884. By GEORGE GABRIEL STOKES, M.A., P.R.S., &c., Fellow of Pembroke College, and Lucasian Professor of Mathematics in the University of Cambridge. First Course. ON THE NATURE OF LIGHT.-Second Course. ON LIGHT AS A MEANS OF INVESTIGATION. Crown 8vo. 2s. 6d. each. [Third Course in the press. Stone.-AN ELEMENTARY TREATISE ON SOUND. W. H. STONE, M.D. With Illustrations. 18mo. 3s. 6d. Tait.-HEAT. By P. G. TAIT, M.A., Sec. R.S. E., formerly Fellow of St. Peter's College, Cambridge, Professor of Natural Philosophy in the University of Edinburgh. Crown 8vo. 6s. Thompson.-ELEMENTARY LESSONS IN ELECTRICITY AND MAGNETISM. By SILVANUS P. THOMPSON, Principal and Professor of Physics in the Technical College, Finsbury. With Illustrations. New Edition. Fcap. 8vo. 45. 6d.

Thomson.-ELECTROSTATICS AND MAGNETISM, REPRINTS OF PAPERS ON. By Sir WILLIAM THOMSON, D.C.L., LL.D., F.R.S., F.R.S.E., Fellow of St. Peter's College, Cambridge, and Professor of Natural Philosophy in the University of Glasgow. Second Edition. Medium 8vo. 18s.

THE MOTION OF VORTEX RINGS, A TREATISE ON. An Essay to which the Adams Prize was adjudged in 1882 in the University of Cambridge. By J. J. THOMSON, Fellow of Trinity College, Cambridge, and Professor of Experimental Physics in the University. With Diagrams. 8vo. 6s. Todhunter.-NATURAL PHILOSOPHY FOR BEGINNERS. By I. TODHUNTER, M.A., F.R.S., D.Sc. Part I. The Properties of Solid and Fluid Bodies. Part II. Sound, Light, and Heat. 18mo. 35. 6d.

18mo. 3s. 6d.

Turner.-HEAT AND ELECTRICITY, A COLLECTION OF EXAMPLES ON. By H. H. TURNER, B.A., Fellow of Trinity College, Cambridge. Crown 8vo. 2s. 6d.

Wright (Lewis).

LIGHT; A COURSE OF EXPERI

MENTAL OPTICS, CHIEFLY WITH THE LANTERN. With nearly 200 Engravings and Coloured 7s. 6d.

By LEWIS Wright.
Plates. Crown 8vo.