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Scientific Works published by Longmans, Green, & Co. 13 TRIGONOMETRY,

CASEY. A TREATISE ON ELEMENTARY TRIGONOMETRY. By JOHN CASEY, LL.D., F.R.S., late Fellow of the Royal University of Ireland. With numerous Examples and Questions for Examination, ismo. , y. GOODWIN. PLANE AND SPHERICAL TRIGONOMETRY. By H. B. GOODWIN, M.A. In Three Parts, comprising those portions of the subjects, theoretical and practical, which are required in the Final Examination for Rank of Lieutenant at Greenwich. 8vo. , 8s. 6d. SOMES. THE BEGINNINGS OF TRIGONOMETRY. By A. CLEMENT JONES, M.A., Ph.D., late Open Scholar and Senior Hulme Exhibitioner of Brasenose College, Oxford ; Senior Mathematical Master of Bradford Grammar School. Crown 8vo., 2s. MA YO. ELEMENTARY TRIGONOMETRY. By C. H. P. MAYO, M.A. , late Scholar of St. Peter's College, Cambridge; Assistant Master at Harrow School. With Examples and Answers. Crown 8vo., 3^. 6d. SMITH. ELEMENTARY TRIGONOMETRY. By J. HAMBLIN SMITH, M.A. Crown 8vo., $s. 6d. Key, js. 6d. SOUND, LIGHT, HEAT, AND THERMODYNAMICS. DEXTER. ELEMENTARY PRACTICAL SOUND, LIGHT AND HEAT. By JOSEPH S. DEXTER, B.Sc. (Lond.), Physics Master, Technical Day School, The Polytechnic Institute, Regent Street. With 152 Illustrations. Crown 8vo., 2s. 6d. EMTAGE. LIGHT. By W. T. A. EMTAGE, M.A., Director of Public Instruction, Mauritius. With 232 Illustrations. Crown 8vo., 6s. HELMHOLTZ.ON THE SENSATIONS OF TONE AS A PHYSIOLOGICAL BASIS FOR THE THEORY OF MUSIC. By HERMANN VON HELMHOLTZ. Royal 8vo., 28s. MAXWELL. THEORY OF HEAT. By J. CLERK MAXWELL, M.A., F.R.SS., L. and E. With Corrections and Additions by Lord RAY LEIGH. With 38 Illustrations. Fcp. 8vo., $s. 6d. PLANCK. TREATISE ON THERMODYNAMICS. By Dr. MAX PLANCK, Professor of Theoretical Physics in the University of Berlin. Translated, with the Author's sanction, by ALEXANDER OGG, M.A., B.Sc., Ph.D., late 1851 Ex- hibition Scholar, Aberdeen University; Assistant Master, Royal Naval Engineering College, Devonport. 8vo., js. 6d. net. SMITH. THE STUDY OF HEAT. By J. HAMBLIN SMITH, M.A., of Gonville and Caius College, Cambridge. Crown 8vo. , 35. TYNDALL. Works by JOHN TYNDALL, D.C.L., F.R.S. See p. 36. WORMELL.^ CLASS-BOOK OF THERMODYNAMICS. By RICHARD WORMELL, B.Sc., M.A. Fcp. 8vo., 15. 6d. WRIGHT. Works by MARK R. WRIGHT, M.A. SOUND, LIGHT, AND HEAT. With 160 Diagrams and Illus- trations. Crown 8vo. , 2s. 6d. ADVANCED HEAT. With 136 Diagrams and numerous Examples and Examination Papers. Crown 8vo. , 4^. 6d?,