Fifth BEASLEY-AN ELEMENTARY TREATISE ON PLANE BOOLE-Works by G. BOOLE, D.C.L., F.R.S., late Professor of Mathematics in the Queen's University, Ireland. A TREATISE ON DIFFERENTIAL EQUATIONS. Third and Revised Edition. Edited by I. TODHUNTER. Crown 8vo. 14s. A TREATISE ON DIFFERENTIAL EQUATIONS. Supplementary Volume. Edited by I. TODHUNTER. Crown 8vo. 8s. 6d. THE CALCULUS OF FINITE Differences. Third Edition, revised by J. F. MOULTON. Cr. 8vo. 10s. 6d. BROOK-SMITH (J.)-ARITHMETIC IN THEORY AND PRACTICE. By J. BROOK-SMITH, M.A., LL.B., St. John's College, Cambridge; Barrister-at-Law; one of the Masters of Cheltenham College. New Edition, revised. Crown 8vo. 4s. 6d. CAMBRIDGE SENATE-HOUSE PROBLEMS and RIDERS WITH SOLUTIONS : 1875-PROBLEMS AND RIDERS. By A. G. GREENHILL, M.A. Crown 8vo. 8s. 6d. 1878-SOLUTIONS OF SENATE-HOUSE PROBLEMS By the Mathematical Moderators and Examiners. Edited by J. W. L. GLAISHER, M.A., Fellow of Trinity College, Cambridge. 125. CANDLER-HELP TO ARITHMETIC. Designed for the use of Schools. By H. CANDLER, M.A., Mathematical Master of Uppingham School. Extra fcap. 8vo 2s. 6d. CHEYNE-AN ELEMENTARY TREATISE ON THE PLANETARY THEORY. By C. H. H. CHEYNE, M. A., F.R.A.S. With a Collection of Problems. Second Edition. Crown 8vo. 6s. 6d. CHRISTIE—A COLLECTION OF ELEMENTARY TEST- CONSTABLE-GEOMETRICAL EXERCISES FOR BE- RULES AND EXAMPLES IN ARITHMETIC. New Edi- DREW'S DREW-GEOMETRICAL TREATISE ON CONIC SEC- 4s. 6d. EDGAR (J. H.) and PRITCHARD (G. S.)—NOTE-BOOK ON PRACTICAL SOLID OR DESCRIPTIVE GEOMETRY. Containing Problems with help for Solutions. By J. H. EDGAR, M.A., Lecturer on Mechanical Drawing at the Royal School of Mines, and G. S. PRITCHARD. Fourth Edition, revised and enlarged, by ARTHUR MEEZE. Globe 8vo. 4s. 6d. FERRERS-Works by the Rev. N. M. FERRERS, M.A., Fellow and Master of Gonville and Caius College, Cambridge. AN ELEMENTARY TREATISE ON TRILINEAR AN ELEMENTARY TREATISE ON SPHERICAL FROST-Works by PERCIVAL FROST, M.A., formerly Fellow of St. John's College, Cambridge; Mathematical Lecturer of King's College. AN ELEMENTARY TREATISE ON CURVE TRA- SOLID GEOMETRY. A New Edition, revised and enlarged GODFRAY-Works by HUGH Godfray, M.A., Mathematical Lecturer at Pembroke College, Cambridge. A TREATISE ON ASTRONOMY, for the Use of Colleges and Schools. New Edition. 8vo. 12s. 6d. AN ELEMENTARY TREATISE ON THE LUNAR THEORY, with a Brief Sketch of the Problem up to the time of Newton. Second Edition, revised. Crown 8vo. 5s. 6d. HEMMING-AN ELEMENTARY TREATISE ON THE DIFFERENTIAL AND INTEGRAL CALCULUS, for the Use of Colleges and Schools. By G. W. HEMMING, M.A., Fellow of St. John's College, Cambridge. Second Edition, with Corrections and Additions. 8vo. 9s. JACKSON GEOMETRICAL CONIC SECTIONS. An Elementary Treatise in which the Conic Sections are defined as the Plane Sections of a Cone, and treated by the Method of Projection. By J. STUART JACKSON, M. A., late Fellow of Gonville and Caius College, Cambridge. Crown 8vo. 4s. 6d. JELLET (JOHN H.)-A TREATISE ON THE THEORY OF FRICTION. By JOHN H. JELLET, B.D., Provost of Trinity College, Dublin; President of the Royal Irish Academy. 8vo. 8s. 6d. JONES and CHEYNE-ALGEBRAICAL EXERCISES. KITCHENER-A GEOMETRICAL NOTE-BOOK, containing LOCK-ELEMENTARY TRIGONOMETRY. By Rev. J. B. Lock, M.A., Fellow of Caius College, Cambridge; AssistantMaster at Eton. Globe 8vo. 4s. 6d. LUPTON.-ELEMENTARY CHEMICAL ARITHMETIC. With 1,100 Problems. By SIDNEY LUPTON, M.A., Assistant Master in Harrow School. Globe 8vo. 55. MAULT-NATURAL GEOMETRY: an Introduction to the Logical Study of Mathematics. For Schools and Technical Classes. With Explanatory Models, based upon the Tachymetrical works of Ed. Lagout. By A. MAULT. 18mo. IS. Models to Illustrate the above, in Box, 12s. 6d. MERRIMAN · ELEMENTS OF THE METHOD LEAST SQUARES. By MANSFIELD MERRIMAN, Ph.D. Professor of Civil and Mechanical Engineering, Lehigh University, Bethlehem, Penn. Crown 8vo. 7s. 6d. OF MILLAR-ELEMENTS OF DESCRIPTIVE GEOMETRY. NEWTON'S PRINCIPIA. Edited by Prof. Sir W. THOMSON and Professor BLACKBURN. 4to cloth. 31s. 6d. THE FIRST THREE SECTIONS OF NEWTON'S PARKINSON-Works by S. PARKINSON, D.D., F.R.S., Tutor and Prælector of St. John's College, Cambridge. AN ELEMENTARY TREATISE ON MECHANICS. A TREATISE ON OPTICS. New Edition, revised and enlarged. Crown 8vo, cloth. IOS. 6d. PEDLEY-EXERCISES IN ARITHMETIC for the Use of Schools. Containing more than 7,000 original Examples. By S. PEDLEY, late of Tamworth Grammar School. Crown 8vo. 5s. PHEAR-ELEMENTARY HYDROSTATICS. With Numerous Examples. By J. B. PHEAR, M.A., Fellow and late Assistant Tutor of Clare College, Cambridge. New Edition. Crown 8vo. 5s. 6d. PIRIE-LESSONS ON RIGID DYNAMICS. By the Rev. G. PIRIE, M.A., late Fellow and Tutor of Queen's College, |