ninth explains some special properties of bodies. The tenth and eleventh contain a radical and lengthy investigation of chemical principles and relations, which may lead to practical results of high importance. The twelfth and last book treats of molecular masses, distances, and powers." Beasley.-AN ELEMENTARY TREATISE ON PLANE TRIGONOMETRY. With Examples. By R. D. BEASLEY, Edition, revised and enlarged. Crown 8vo. cloth. 35. 6d. This treatise is specially intended for use in schools. The choice of matter has been chiefly guided by the requirements of the three days' examination at Cambridge. About four hundred examples have been added to this edition, mainly collected from the Examination Papers of the last ten years. Blackburn (Hugh.) — ELEMENTS OF PLANE TRIGONOMETRY, for the use of the Junior Class of Mathematics in the University of Glasgow. By Hugh BLACKBURN, M.A., Professor of Mathematics in the University of Glasgow Globe Svo. The author having felt the want of a short treatise to be used as a Text-Book after the Sixth Book of Euclid had been learned and some knowledge of Algebra acquired, which should contain satisfactory demonstrations of the propositions to be used in teaching Junior Students the solution of Triangles, and should at the same time lay a solid foundation for the study of Analytical Trigonometry, thinking that others may have felt the same want, has attempted to supply it by the publication of this little work. Boole.-Works by G. BOOLE, D.C.L., F.R.S., Professor of Mathematics in the Queen's University, Ireland. A TREATISE ON DIFFERENTIAL EQUATIONS. New and Revised Edition. Edited by I. TODHUNTER. Crown 8vo. cloth. 145. Professor Boole has endeavoured in this treatise to convey as complete an account of the present state of knowledge on the subject of Differential Equations, as was consistent with the idea of a work intended, primarily, for Is. 60. Boole-continued. elementary instruction. The earlier sections of each chapter contain that kind of matter which has usually been thought suitable for the beginner, while the latter ones are devoted either to an account of recent discovery, or the discussion of such deeper questions of principle as are likely to present themselves to the reflective student in connexion with the methods and processes of his previous course. “ A treatise incomparably superior to any other elementary book on the same subject with which we are acquainted.”—PHILOSOPHICAL MAGAZINE. A TREATISE ON DIFFERENTIAL EQUATIONS. Supple mentary Volume. Edited by I. TODHUNTER. Crown 8vo. cloth. 8s. 6d. This volume contains all that Professor Boole wrote for the purpose of enlarging his treatise on Differential Equations, Aѕ ап THE CALCULUS OF FINITE DIFFERENCES. Crown 8vo. cloth. Ios. 6d. In this exposition of the Calculus of Finite Differences, particular attention has been paid to the connexion of its methods with those of the Differential Calculus—a connexion which in some instances involves far more than a merely formal analogy. The work is in some measure designed as a sequel to Professor Boole's Treatise on Differential Equations. original book by one of the first mathematicians of the age, it is out of all comparison with the mere second-hand compilations which have hiiherto been alone accessible to the student.”—PHILOSOPHICAL MAGAZINE. Cambridge Senate-House Problems and Riders, WITHI SOLUTIONS :- cloth. 155. 6d. MACKENZIE. 8vo. cloth. Ios. 6d. 1857. — PROBLEMS AND RIDERS. By CAMPION and WALTON. 8vo, cloth. 8s. 6d. Cambridge Senate House Problems-continued. 1860.-PROBLEMS AND RIDERS. By WATSON and ROUTH. Crown 8vo. cloth. 75. 6d. 1864.—PROBLEMS AND RIDERS. By WALTON and WIL KINSON. 8vo. cloth. Ios. 6d. These volumes will be found of great value to Teachers and Students, as indicating the style and range of mathenatical study in the University of Cambridge. CAMBRIDGE COURSE OF ELEMENTARY NATURAL PHILOSOPHY, for the Degree of B. A. Originally compiled by Crown 8vo, cloth. 55. This work will be found adapted to the wants, not only of University Students, but also of many others who require a short course of Mechanics and Hydrostatics, and especially of the candidates at our Middle Class Examinations. At the end of each chapter a series of easy questions is added for the exercise of the student. CAMBRIDGE AND DUBLIN MATHEMATICAL JOURNAL. The Complete Work, in Nine Vols. 8vo. cloth, 71. 45. Only a few copies remain on hand. Among Contributors to this work will be found Sir W. Thomson, Stokes, Adams, Boole, Sir W. R. Hamilton, De Morgan, Cayley, Sylvester, Jellett, and other distinguished mathematicians. 25, 6d. Candler.--HELP TO ARITHMETIC. Designed for the use of Schools. By II. CANDLER, M.A. Mathematical Master of Uppingham School. Extra fcap. Svo. This work is intended as a companion to any text-book that may be “ The main difficulties which boys experience in the different rules are skilfully dealt with and removed.”—MUSEUM. ? in use. Cheyne.--Works by C. H. H. CHEYNE, M.A., F.R.A.S. THEORY. With a Collection of Problems. Second Edition. Crown 8vo. cloth. 6s. 6d. In this volume, an attempt has been made to produce a treatise on the Planetary theory', which, being elementary in character, should be so far complete as to contain all that is usually required by students in the University of Cambridge. In the New Edition the work has been carefully revised. The stability of the Planetary System has been more fully treated, and an elegant geometrical explanation of the formula for the secular variation of the node and inclination has been introduced. The first part of this work consists of an application of the method of the variation of elements to the general problem of rotation. In the second part the general rotation formulæ are applied to the particular case of the earth. Childe.—THE SINGULAR PROPERTIES OF THE ELLIP. SOID AND ASSOCIATED SURFACES OF THE NTH DEGREE. By the Rev. G. F. CHILDE, M.A., Author of “Ray Surfaces,' Related Caustics,” &c. 8vo. IOS. 6d. The object of this volume is to develop peculiarities in the Ellipsoid ; and, further, to establish analogous properties in the unlimited congeneric series of which this remarkable surface is a constituent. Christie.--A COLLECTION OF ELEMENTARY TEST. QUESTIONS IN PURE AND MIXED MATHEMATICS; Royal Military Academy, Woolwich. Crown 8vo. cloth. 8s. 6d. The series of Mathematical exercises here offered to the public is collected from those which the author has, from time to time, proposed for solution by his pupiis during a long career at the Royal Military Academy. A student who finds that he is able to solve the larger portion of these exercises, may consider that he is thoroughly well grounded in the elementary prin. ciples of pure and mixed Mathematics. Dalton.-ARITHMETICAL EXAMPLES. Progressively arranged, with Exercises and Examination Papers. By the Rev. T. DALTON, M.A., Assistant Master of Eton College. 18mo. cloth. Answers to the Examples are appended. 25. 6d. Day.- PROPERTIES OF CONIC SECTIONS PROVED GEOMETRICALLY. PART I., THE ELLIPSE, with Sedburgh Grammar School. Crown 8vo. 35. 6d. The object of this book is the introduction of a treatment of Conic Sections which should be simple and natural, and lead by an easy transi. tion to the analytical methods, without departing from the strict geometry of Euclid. Dodgson.-AN ELEMENTARY TREATISE ON DETER MINANTS, with their Application to Simultaneous Linear Ios. 6d. The object of the author is to present the subject as a continuous chain of argument, separated from all accessories of explanation or illustration. All such explanation and illustration as seemed necessary for a beginner are introduced, either in the form of foot-notes, or, where that would have occupied too much room, of Appendices. “ The work,” says the EDUCATIONAL TIMES, “ forms a valuable addition to the treatises we possess on modern Algebra.” Drew.--GEOMETRICAL TREATISE ON CONIC SEC. TIONS. By W. H. DREW, M. A., St. John's College, Cambridge. Fourth Edition. Crown Svo. cloth. 45. 6d. In this work the subject of Ccnic Sections has teen placed before the student |