_Ellenberger’s Course of Arithmetic_, as taught in the Pestalozzian School, Worksop. Post 8vo. 5s. cloth. ⁂ _The Answers to the Questions in this Volume are now ready, price 1s. 6d_. _Mason’s First Book of Euclid. Explained to Beginners._ Fcap. 8vo. 1s. 9d. _Reiner’s Lessons on Form; or, An Introduction to Geometry, as given in a Pestalozzian School, Cheam, Surrey._ 12mo. 3s. 6d. _Reiner’s Lessons on Number, as given in a Pestalozzian School, Cheam, Surrey._ Master’s Manual, 5s. Scholar’s Praxis, 2s. _Tables of Logarithms Common and Trigonometrical_ to Five Places. Under the Superintendence of the Society for the Diffusion of Useful Knowledge. Fcap. 8vo. 1s. 6d. _Four Figure Logarithms and Anti-Logarithms. On a Card._ Price 1s. _Barlow’s Tables of Squares, Cubes, Square Roots, Cube Roots, and Reciprocals_ of all Integer Numbers, up to 10,000. Royal 12mo. 8s. =MIXED MATHEMATICS=. _Potter’s Treatise on Mechanics, for Junior University Students._ By RICHARD POTTER, M.A., Professor of Natural Philosophy in University College, London. Third Edition. 8vo. 8s. 6d. _Potter’s Treatise on Optics. Part I._ All the requisite Propositions carried to First Approximations, with the construction of Optical Instruments, for Junior University Students. Second Edition. 8vo. 9s. 6d. _Potter’s Treatise on Optics. Part II._ The Higher Propositions, with their application to the more perfect forms of Instruments. 8vo. 12s. 6d. _Potter’s Physical Optics; or, the Nature and Properties of Light._ A Descriptive and Experimental Treatise. 100 Illustrations. 8vo. 6s. 6d. _Newth’s Mathematical Examples. A graduated series of Elementary Examples, in Arithmetic, Algebra, Logarithms, Trigonometry, and Mechanics._ Crown 8vo. With Answers. 8s. 6d. cloth. _Sold also in separate Parts, without Answers_:-- Arithmetic, 2s. 6d. Algebra, 2s. 6d. Trigonometry and Logarithms, 2s. 6d. Mechanics, 2s. 6d. _Newth’s Elements of Mechanics, including Hydrostatics, with numerous Examples._ By SAMUEL NEWTH, M.A., Fellow of University College, London. Second Edition. Large 12mo. 7s. 6d. cloth. _Newth’s First Book of Natural Philosophy; or an Introduction to the Study of Statics, Dynamics, Hydrostatics, and Optics, with numerous Examples._ 12mo. 3s. 6d. cloth. =NATURAL PHILOSOPHY, ASTRONOMY, Etc=.