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 Johnson.— A treatise on trigonometry. By W. E. Johnson, M.A., late Scholar and Assistant Lecturer in Mathe- matics of King's College, Cambridge. Crown 8vo. Ss. 6d. Lock. — Works by Rev. J. B. Lock, M.A., Senior Fellow, Assistant Tutor and Lecturer in Gonville and Caius College, Cambridge ; formerly Master at Eton. TRIGONOMETRY FOR BEGINNERS, as far as the Solution of Triangles. Globe 8vo. 2s. 6d. A KEYTO " TRIGONOMETRY FOR BEGINNERS." AdajHcd from the key to " Elementary Trigonometry." Crown 8vo. 6s. 6d. ELEMENTARY TRIGONOMETRY. Sixth Edition (in this edition the chapter on logarithms has been carefully revised.) Globe Svo. 4.f. 6d. fiU. E. J. RouTH. D.Sc, F.R.S., writes: — "It is an able treatise. It takes the dirticuliies of the subject one at a time, and so leads the young student easily along." A KEY TO " ELEMENTARY TRIGONOMETRY." By Henry Carr, B.A., of the Grammar School, Lagos, West Africa. Crown Svo. Ss. 6d. HIGHER TRIGONOMETRY. Fifth Edition. Globe 8vo. 4s. 6J. Both Parts complete in One Volume. Globe Svo. ys. 6d. { See also under Arithmetic, Higher JIathemalics, and Euclid. ) M'Clelland and Preston.— A TREATISE ON SPHERICAL TRIGONOMETRY. With applications to Spherical Geometry and numerous Examples. By William J. M'Clelland, M.A., Principal of the Incorporated Society's School, Santry, Dublin, and Thomas Preston, Sch.B. A. In Two Parts. Crown Svo. Part I. To the End of Solution of Triangles, 4?. 6d. Part II., 51. Both Parts in one Volume. 2>s. 6d. Palmer.— TEXT-BOOK OF PRACTICAL LOGARITHMS AND TRIGONOMETRY. By J. H. Palmer, Head School- master U.N., II. M.S. Cambridge, Devonport. Globe Svo. 4.?. 6./. Snowball. — the elements of plane and spheri- CAL trigonometry. By J. C. Snowball, M.A, Four- teenth Edition. Crown Svo. 7^. 6</. Todhunter. — Works by I. TODHUNTER, M.A., F.R.S., D.Sc, late of St. John's College, Cambridge. TRIGONOMETRY FOR BEGINNERS. With numerou! Examples. New Edition. iSmo. 2i. dd. KEY TO TRIGONOMETRY FOR BEGINNERS. Cr.Svo. Zs.dd PLANE TRIGONOMETRY. For Schools and Colleges. New Edition. Crown Svo. 5^. KEY TO PLANE TRIGONOMETRY. Crown Svo. Oi. Gd. A TREATISE ON SPHERICAL TRIGONOMETRY. Nev Edition, enlarged. Crown Svo. 41. 6d. (Sec also under Arithmetic and MensuraHcn, Algebra, and Ilighet Mathematics.)