SECOND COURSE: HEAT, COMMON ELECTRICITY, MAGNETISM, VOLTAIC ELECTRICITY. 200 Woodcuts. 8s. 6d. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * NEW WORK ON ARITHMETIC. 12mo., 5s. cloth. A COURSE OF ARITHMETIC AS TAUGHT IN THE PESTALLOZZIAN SCHOOL, WORKSOP. By J. L. ELLENBERGER. "A happy combination of theory and practice, containing explanation and demonstration enough to afford wholesome mental discipline, and yet not too difficult to be understood by pupils of average ability. In every case the reason why a particular process is adopted in order to obtain the desired result is clearly set forth."--_Athenaeum._ London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * PROFESSOR BOOLE'S NEW WORK. Just published, 8vo., 14s., THE LAWS OF THOUGHT, on which are founded the Mathematical Theories of Logic and Probabilities. By GEORGE BOOLE, Professor of Mathematics in Queen's College, Cork. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * Just published, fcp. 8vo., 1s. 9d., EUCLID EXPLAINED.--The First Book of Euclid Explained to Beginners. By C. P. MASON, B.A., Fellow of University College, and Principal of Denmark Hill Grammar School. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * YOUNG MEN'S CHRISTIAN ASSOCIATION. Just published, crown 8vo., 1s. sewed, 1s. 6d. cloth, BUSINESS AS IT IS AND AS IT MIGHT BE. By JOSEPH LYNDALL. This work obtained the prize of fifty guineas offered by the Young Men's Christian Association for the best Essay on the Evils of the Present System of Business, and the Difficulties they present to the Attainment and Development of Personal Piety, with Suggestions for their Removal. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * Second Edition, 500 Woodcuts, 2l. 2s., DR. WM. SMITH'S DICTIONARY OF GREEK AND ROMAN ANTIQUITIES. By various Writers. Medium 8vo. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * 500 Woodcuts, 3 vols. medium 8vo., 5l. 15s. 6d., DR. WM. SMITH'S DICTIONARY OF GREEK AND ROMAN BIOGRAPHY AND MYTHOLOGY. By various Writers. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * MR. QUAIN'S NEW WORK. Now ready, crown 8vo., with coloured Plates, 7s. 6d., cloth, DISEASES OF THE RECTUM. By RICHARD QUAIN, F.R.S., Professor of Clinical Surgery in University College, and Surgeon to University College Hospital. London: WALTON & MABERLY, Upper Gower Street, and Ivy Lane, Paternoster Row. * * * * * COMPLETION OF THE FIRST VOLUME OF DR. SMITH'S DICTIONARY OF GEOGRAPHY.