Compound Interest and Annuities. THEORY of COMPOUND INTEREST and ANNUITIES; with Tables of Logarithms for the more Difficult Computations of Interest, Discount, Annuities, &c., in all their Applications and Uses for Mercantile and State Purposes. By FÉDOR THOMAN, of the Société Crédit Mobilier, Paris. 3rd Edit., 12mo, 4s. 6d. cl. Iron and Metal Trades' Calculator. THE IRON AND METAL TRADES' COMPANION: Being a Calculator containing a Series of Tables upon a new and comprehensive plan for expeditiously ascertaining the value of any goods bought or sold by weight, from Is. per cwt. to 1125. per cwt., and from one farthing per lb. to Is. per lb. Each Table extends from one lb. to 100 tons. By T. DOWNIE. 396 pp., 9s., leather. "Will supply a want, for nothing like it before existed."-Building News. Iron and Steel. IRON AND STEEL: a Work for the Forge, Foundry, Factory, and Office. Containing Information for Ironmasters and their Stocktakers; Managers of Bar, Rail, Plate, and Sheet Rolling Mills; Iron and Metal Founders; Iron Ship and Bridge Builders; Mechanical, Mining, and Consulting Engineers; Architects, Builders, &c. By CHARLES HOARE, Author of "The Slide Rule,' &c. Eighth Edition. Oblong 32m0, 6s., leather. For comprehensiveness the book has not its equal."-Iron. Comprehensive Weight Calculator. THE WEIGHT CALCULATOR, being a Series of Tables upon a New and Comprehensive Plan, exhibiting at one Reference the exact Value of any Weight from 1lb. to 15 tons, at 300 Progressive Rates, from I Penny to 168 Shillings per cwt., and containing 186,000 Direct Answers, which, with their Combinations, consisting of a single addition (mostly to be performed at sight), will afford an aggregate of 10,266,000 Answers; the whole being calculated and designed to ensure Correctness and promote Despatch. By HENRY HARBEN, Accountant, Sheffield. New Edition. Royal 8vo, 17. 5s., strongly half-bound. Comprehensive Discount Guide. THE DISCOUNT GUIDE: comprising several Series of Tables for the use of Merchants, Manufacturers, Ironmongers, and others, by which may be ascertained the exact profit arising from any mode of using Discounts, either in the Purchase or Sale of Goods, and the method of either Altering a Rate of Discount, or Advancing a Price, so as to produce, by one operation, a sum that will realise any required profit after allowing one or more Discounts: to which are added Tables of Profit or Advance from 1 to 90 per cent., Tables of Discount from 1 to 98 per cent., and Tables of Commission, &c., from 1 to 10 per cent. By HENRY HARBEN, Accountant. New Edition. Demy 8vo, 17. 5s., half-bound. Mathematical Instruments. MATHEMATICAL INSTRUMENTS: Their Construction, SCIENCE AND ART. Gold and Gold-Working. THE GOLDSMITH'S HANDBOOK: containing full instruc- "The best work yet printed on its subject for a reasonable price." —Jeweller. Essentially a practical manual, well adapted to the wants of amateurs and apprentices, containing trustworthy information that only a practical man can supply."-English Mechanic. Silver and Silver Working. THE SILVERSMITH'S HANDBOOK, containing full Instructions for the Alloying and Working of Silver. Including the different Modes of Refining and Melting the Metal, its Solders, the Preparation of Imitation Alloys, &c. By G. E. GEE. 12m0, 3s. 6d. "The chief merit of the work is its practical character. The workers in the trade will speedily discover its merits when they sit down to study it."-English Mechanic. Hall-Marking of Jewellery. THE HALL-MARKING OF JEWELLERY PRACTICALLY Electro-Plating, &c. ELECTROPLATING: A Practical Handbook. By J. W. "Any ordinarily intelligent person may become an adept in electro-deposition with a very little science indeed, and this is the book to show the way."-Builder. Electrotyping, &c. ELECTROTYPING: A Practical Manual on the Reproduction "A guide to beginners and those who practise the old and imperfect methods."—Iron. Electro-Plating. ELECTRO-METALLURGY PRACTICALLY TREATED. BY ALEXANDER WATT, F.R.S.S.A. Including the ElectroDeposition of Copper, Silver, Gold, Brass and Bronze, Platinum, Lead, Nickel, Tin, Zinc, Alloys of Metals, Practical Notes, &c., &c. Seventh Edition, Revised and Enlarged, including the most recent Processes. 12mo, 3s. 6d. cloth. "From this book both amateur and artisan may learn everything necessary for the successful prosecution of electroplating."-Iron. "A practical treatise for the use of those who desire to work in the art of electrodeposition as a business."-English Mechanic. Dentistry. MECHANICAL DENTISTRY. A Practical Treatise on the Construction of the various kinds of Artificial Dentures. Comprising also Useful Formulæ, Tables, and Receipts for Gold Plate, Clasps, Solders, etc., etc. By CHARLES HUNTER. Second Edition, Revised; including a new chapter on the use of Celluloid. With over 100 Engravings. Cr. 8vo, 7s. 6d. cl. [Just published. "An authoritative treatise, which we can strongly recommend to all students." Dublin Journal of Medical Science. "The best book on the subject with which we are acquainted."—Medical Prese. Electricity. A MANUAL of ELECTRICITY; including Galvanism, Magnetism, Diamagnetism, Electro-Dynamics, Magneto-Electricity, and the Electric Telegraph. By HENRY M. NOAD, Ph.D., F.C.S. Fourth Edition, with 500 Woodcuts. 8vo, 17. 45. cloth. "The accounts given of electricity and galvanism are not only complete in a scientific sense, but, which is a rarer thing, are popular and interesting."-Lancet. Text-Book of Electricity. THE STUDENT'S TEXT-BOOK OF ELECTRICITY. By "A reflex of the existing state of Electrical Science adapted for students."W. H. Preece, Esq., vide "Introduction." "We can recommend Dr. Noad's book for clear style, great range of subject, a good index, and a plethora of woodcuts. Such collections as the present are indispensable."-Athenaum. "An admirable text-book for every student-beginner or advanced-of electricity." -Engineering. "Recommended to students as one of the best text books on the subject that they can have. Mr. Preece appears to have introduced all the newest inventions in the shape of telegraphic, telephonic, and electric-lighting apparatus."-English Mechanic. "Under the editorial hand of Mr. Preece the late Dr. Noad's text book of elec. tricity has grown into an admirable handbook."-Westminster Review. Electric Lighting. ELECTRIC LIGHT: Its Production and Use, embodying plain Directions for the Working of Galvanic Batteries, Electric Lamps, and Dynamo-Electric Machines. By J. W. URQUHART, C.E., Author of "Electroplating." Edited by F. C. WEBB, M.I.C.E., M.S.T.E. With 94 Illustrations. Crown 8vo, 7s. 6d. cloth. "The book is by far the best that we have yet met with on the subject."-Athenæum. "An important addition to the literature of the electric light. Students of the subject should not fail to read it."-Colliery Guardian. Lightning, &c. THE ACTION of LIGHTNING, and the MEANS of DE- "Major Parnell has written an original work on a scientific subject of unusual interest; and he has prefaced his arguments by a patient and almost exhaustive citation of the best writers on the subject in the English language."-Athenæum. "The work comprises all that is actually known on the subject."-Land. Major Parnell's measures are based on the results of experience. A valuable repertoire of facts and principles arranged in a scientific form."-Building News. The Alkali Trade-Sulphuric Acid, &c. A MANUAL OF THE ALKALI TRADE, including the Manufacture of Sulphuric Acid, Sulphate of Soda, and Bleaching Powder. By JOHN LOMAS, Alkali Manufacturer, Newcastle-uponTyne and London. With 232 Illustrations and Working Drawings, and containing 386 pages of text. Super-royal 8vo, 21. 12s. 6d. cloth. This work provides (1) a Complete Handbook for intending Alkali and Sulphuric Acid Manufacturers, and for those already in the field who desire to improve their plant, or to become practically acquainted with the latest processes and developments of the trade; (2) a Handy Volume which Manufacturers can put into the hands of their Managers and Foremen as a useful guide in their daily rounds of duty. SYNOPSIS OF CONTENTS. Chap. I. Choice of Site and General | IX. Carbonating or Finishing-X. Soda Plan of Works-II. Sulphuric Acid- Crystals XI. Refined Alkali- XII. III. Recovery of the Nitrogen Com- Caustic Soda-XIII. Bi-carbonate of pounds, and Treatment of Small Pyrites Soda-XIV. Bleaching Powder - XV. -IV. The Salt Cake Process-V. Legis- Utilisation of Tank Waste-XVI. General lation upon the Noxious Vapours Ques- Remarks-Four Appendices, treating of tion-VI. The Hargreaves' and Jones' Yields, Sulphuric Acid Calculations, AneProcesses-VII. The Balling Process- mometers, and Foreign Legislation upon VIII. Lixiviation and Salting Down- the Noxious Vapours Question. "The author has given the fullest, most practical, and, to all concerned in the alkali trade, most valuable mass of information that, to our knowledge, has been published in any language."-Engineer. "This book is written by a manufacturer for manufacturers. The working details of the most approved forms of apparatus are given, and these are accompanied by no less than 232 wood engravings, all of which may be used for the purposes of construction. Every step in the manufacture is very fully described in this manual, and each improvement explained. Everything which tends to introduce economy into the technical details of this trade receives the fullest attention. The book has been produced with great completeness."-Athenæum. "The author is not one of those clever compilers who, on short notice, will 'read up' any conceivable subject, but a practical man in the best sense of the word. We find here not merely a sound and luminous explanation of the chemical principles of the trade, but a notice of numerous matters which have a most important bearing on the successful conduct of alkali works, but which are generally overlooked by even the most experienced technological authors. This most valuable book, which we trust will be generally appreciated, we must pronounce a credit alike to its author and to the enterprising firm who have undertaken its publication."-Chemical Review. Chemical Analysis. THE COMMERCIAL HANDBOOK of CHEMICAL ANALYSIS; or Practical Instructions for the determination of the Intrinsic or Commercial Value of Substances used in Manufactures, in Trades, and in the Arts. By A. NORMANDY, Author of "Practical Introduction to Rose's Chemistry," and Editor of Rose's "Treatise on Chemical Analysis." New Edition. Enlarged, and to a great extent re-written, by HENRY M. NOAD, Ph. D., F.R.S. With numerous Illustrations. Cr. 8vo, 12s. 6d. cloth. "We recommend this book to the careful perusal of every one; it may be truly affirmed to be of universal interest, and we strongly recommend it to our readers as a guide, alike indispensable to the housewife as to the pharmaceutical practitioner."— Medical Times. "Essential to the analysts appointed under the new Act. The most recent results are given, and the work is well edited and carefully written."-Nature. Dr. Lardner's Museum of Science and Art. THE MUSEUM OF SCIENCE AND ART. Edited by DIONYSIUS LARDNER, D.C.L., formerly Professor of Natural Philosophy and Astronomy in University College, London. With upwards of 1200 Engravings on Wood. In 6 Double Volumes. Price I Is., in a new and elegant cloth binding, or handsomely bound in half morocco, 31s. 6d. OPINIONS OF THE PRESS. "This series, besides affording popular but sound instruction on scientific subjects, with which the humblest man in the country ought to be acquainted, also undertakes that teaching of 'common things' which every well-wisher of his kind is anxious to promote. Many thousand copies of this serviceable publication have been printed, in the belief and hope that the desire for instruction and improvement widely prevails; and we have no fear that such enlightened faith will meet with disappointment."-Times. "A cheap and interesting publication, alike informing and attractive. The papers combine subjects of importance and great scientific knowledge, considerable inductive powers, and a popular style of treatment."-Spectator. "The Museum of Science and Art' is the most valuable contribution that has ever been made to the Scientific Instruction of every class of society.”—Sir David Brewster in the North British Review. "Whether we consider the liberality and beauty of the illustrations, the charm of the writing, or the durable interest of the matter, we must express our belief that there is hardly to be found among the new books, one that would be welcomed by people of so many ages and classes as a valuable present.”—Examiner. Separate books formed from the above, suitable for Workmen's COMMON THINGS EXPLAINED. Containing Air, Earth, Fire, THE MICROSCOPE. Containing Optical Images, Magnifying Glasses, Origin and Description of the Microscope, Microscopic Objects, the Solar Microscope, Microscopic Drawing and Engraving, &c. 147 Illustrations, cloth gilt, 25. POPULAR GEOLOGY. Containing Earthquakes and Volcanoes, the Crust of the Earth, etc. 201 Illustrations, cloth gilt, 2s. 6d. POPULAR PHYSICS. 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