A TREATISE ON NAVIGATION AND NAUTICAL ASTRONOMY, adapted to Practice, and to the Purposes of Elementary Instruction; containing the Elementary Principles of Algebra, Geometry, Plane and Spherical Trigonometry, and Navigation; the Method of keeping a Sea Journal; Concise and Simple Rules, with their Investigations, for finding the Latitude and Longitude, and the Variation of the Compass, by Celestial Observations; the Solution of other useful Nautical Problems; with an extensive Series of Examples for Exercise, and all the Tables requisite in Nautical Computations. By EDWARD RIDDLE, Master of the Mathematical School, Royal Naval Asylum, Greenwich. In 8vo. price 11s. boards, or 12s. bound. THE ELEMENTS OF BOOK-KEEPING; comprising a System of Merchants' Accounts, founded on real Business, and adapted to Modern Practice. With an Appendix on Exchange, Banking, and other Commercial Subjects. By P. KELLY, LL.D. Master of the Finsbury-square Academy. Eighth Edition, 8vo. price 7s. bound. A PRACTICAL INTRODUCTION TO SPHERICS AND NAUTICAL ASTRONOMY; being an Attempt to simplify these useful Sciences, with an Appendix on Time-keepers and Transit Instruments. By the same Author. Fourth Edition, in royal 8vo. price 12s. RULED BOOKS, on the best Writing Paper, for Students using Dr. Kelly's Book-keeping, viz. 1. A Waste-book and Journal, and Ledger; adapted to the Second Set; price 5s.--2. A Waste-book and Cash-book. Invoice-book and Sales-book, Bill-book, Journal, and Ledger; adapted to the Third Set. Price 12s. 6d. A NEW SCHOOL ATLAS of Modern Geography, containing Maps of all the principal States and Kingdoms of the World (to which is added a Map of Canaan or Judea for Scripture reading), the whole compiled from the latest and best authorities. By I. C. RUSSELL, Geographer. Finely engraved on twenty-five plates with all discoveries to the present time, in 8vo. outlined. Neatly half-bound. Price 12s. *** The Maps are printed on a fine stout Drawing Paper. THE BIBLE ATLAS; or, Sacred Geography Delineated, in a Complete Series of Scriptural Maps, drawn from the latest and best authorities, and engraved by Richard Palmer. Dedicated, by permission, to His Grace the Archbishop of York. Engraved on 26 small 4to. plates. Price 16s. coloured, or 12s. plain, neatly half-bound. These Maps are all newly constructed after a careful and critical examination of the recent discoveries of Burckhardt, Richardson, Henneker, Wells, &c.; and references to them are facilitated by a copious consulting Index. OSTELL'S NEW GENERAL ATLAS; containing distinct Maps of all the principal States and Kingdoms throughout the World, from the latest and best authorities, including Eight Maps of Ancient Greece, the Roman Empire, and Canaan or Judea; the whole correctly engraved upon thirty plates, royal quarto, and beautifully coloured outlines. Price 18s. neatly half-bound, or full-coloured, price 1l. 1s.