6 WORKS PRINTED FOR TAYLOR AND WALTON, 



Natural 



POTTER' S ELEMENTARY TREATISE ON MECHANICS, 



for the use of the Junior University Students. By RICHARD POTTER, A.M., 

 late Fellow of Queen's College, Cambridge, Professor of Natural Philosophy 

 in University College, London. 8vo, with numerous Diagrams. 8s. 6d. cloth. 



POTTER'S ELEMENTARY TREATISE ON OPTICS. Svo, 



with numerous Diagrams. 9s. 6d. cloth. 



This volume contains all the requisite propositions carried to first approximations ; and the 

 construction of Reflecting and Refracting Telescopes and Microscopes, the Solar, 

 Oxyhydrogen and Lucernal Microscopes ; the Magic and Phantasmagoria Lantern ; 

 the Daguerreotype ; Camera Ohscura ; Hadley's Sextant and Reflecting Circles ; the 

 Optical Square ; the Screw Micrometer ; the Goniometer, &c. 



YOUNG'S LECTURES ON NATURAL PHILOSOPHY AND 



THE MECHANICAL ARTS. A New Edition, with References and Notes, 

 by the Rev. P. KELLAND, M.A., F.R S. London and Edinburgh, late Fellow of 

 Queen's College, Cambridge, Professor of Mathematics, &c. in the University 

 of Edinburgh. 2 vols. 8vo, with 43 Copper Plates. 1Z. 4s. cloth. 



" All who seek information should know that Young is not merely a popular writer, 

 but by far the most popular of those whose accuracy can be relied on in a vast range of 

 subjects, and who have actually written through that range." Athenaeum. 



TWELVE PLANISPHERES, forming a Guide to the Stars for 



every Night in the Year, with an Introduction. 8vo. 6s. 6d. cloth. 



DE MORGAN'S ELEMENTS OF ARITHMETIC. By AUGUSTUS 



DE MORGAN, Professor of Mathematics in University College, London. Fifth 

 Edition, with Eleven new Appendixes. Royal 12mo. 5s. cloth. 



" At the time when this work was first published, the importance of establishing 

 arithmetic in the young mind, upon reason and demonstration, was not admitted by 

 many. The case is now altered : schools exist in which rational arithmetic is taught, 

 and mere rules are made to do no more than their proper duty. There is no necessity 

 to advocate a change which is actually in progress, as the works which are published 

 every day sufficiently show. And my principal reason for alluding to the subject here 

 is merely to warn those who want nothing but routine, that this is not the book for their 

 purpose." Author's Preface. 



DE MORGAN'S ARITHMETICAL BOOKS AND AUTHORS. 



Royal 12mo. 6s. (See page 4). 



DE MORGAN'S ELEMENTS OF ALGEBRA, preliminary to 



the Differential Calculus. Second Edition. Royal 12mo. 9s. cloth. 



DE MORGAN'S ELEMENTS OF TRIGONOMETRY AND 



TRIGONOMETRICAL ANALYSIS, preliminary to the Differential Calculus. 

 Royal 12mo. 9s. cloth. 



TABLES OF LOGARITHMS, COMMON AND TRIGONO- 

 METRICAL, TO FIVE PLACES. Under the Superintendence of the Society 

 for the Diffusion of Useful Knowledge. Foolscap 8vo. 3s. sewed. 



REINER'S LESSONS ON FORM; or, AN INTRODUCTION TO 



GEOMETRY, as given in a Pestalozzian School, Cheam, Surrey. 12mo, with 



numerous Diagrams. 3s. 6d. cloth. 



" It has been found in the actual use of these lessons, for a considerable period, that a 

 larger average number of pupils are brought to study the Mathematics with decided 

 success, and that all pursue them in a superior manner." Rev. Dr. Mayo. 



REINER'S LESSONS ON NUMBER, as given at a Pestaloz- 



zian School, at Cheam, Surrey. Second Edition, Consisting of 

 THE MASTER'S MANUAL. 12mo. 4s. 6d cloth. 

 THE SCHOLAR'S PRAXIS. 12mo. 2s. bound. 



