=Kellogg.=—A New Monetary System. By Edward Kellogg. Seventh Edition. Edited by Mary Kellogg Putnam. 12mo., paper cover $1 00 Bound in cloth $1 50 =Kentish.=—Treatise on a Box of Instruments and the Slide Rule. By T. Kentish. 12mo. $1 25 =Kerl.=—The Assayer’s Manual. An abridged Treatise on the Docimastic examination of Ores and Furnace and other Artificial Products. Edited by Dr. W. H. Wahl. 65 engravings. 8vo. $3 00 =Kingzett.=—The History, Products, and Processes of the Alkali Trade. 23 Illus. 8vo. $2 50 =Kinsley’s Self-Instructor on Lumber Surveying.=—By C. Kinsley. 1 vol. 12mo. $2 00 =Kirk.=—The Founding of Metals. By Edward Kirk. Illustrated 8vo. $2 50 =Kittredge.=—The Compendium of Architectural Sheet-Metal Work. By A. O. Kittredge. Profusely Illustrated. 565 pages. 8vo. $5 00 =Landrin.=—A Treatise on Steel. By A. A. Fesquet. 12mo. $3 00 =Larden.=—A School Course on Heat. By W. Larden, M.A. 321 pages. 12mo. $2 00 =Lardner.=—A Rudimentary Treatise on the Steam-Engine, for the use of Beginners, by Dr. Lardner. Thirteenth Edition, Illustrated. 12mo. 75 =Larkin.=—The Practical Brass and Iron Founder’s Guide. By James Larkin. 12mo. $2 25 =Leroux.=—A Practical Treatise on the Manufacture of Worsteds and Carded Yarns. By A. A. Fesquet. 12 plates. 8vo. $5 00 =Leffel.=—The Construction of Mill Dams. Illustrated by 58 engravings. 8vo. $2 50 =Leslie.=—Complete Cookery. 60th Ed. 12mo. $1 50 =Lieber.=—Assayer’s Guide. By Oscar M. Lieber. Illustrated. 12mo. $1 25 =Love.=—The Art of Dyeing, Cleaning, Scouring, and Finishing, on the most approved English and French Methods. By Thos. Love. 8vo. $5 00 =Lukin.=—Amongst Machines. Illus. 12mo. $1 75 =Lukin.=—The Boy Engineers. Illust. 12mo. $1 75 =Lukin.=—The Young Mechanic. Illustrated. 12mo. $1 75 =Main and Brown.=—The Marine Steam-Engine. By T. J. Main and T. Brown. Illus. 8vo. $5 00 =Main and Brown.=—Questions on Subjects connected with the Marine Steam-Engine $1 50 =Main and Brown.=—The Indicator and Dynamometer. Illustrated. 8vo. $1 50 =Martin.=—Screw-Cutting Tables, for the Use of Mechanical Engineers. By W. A. Martin 50 =Michell.=—Mine Drainage. Being a complete and practical treatise on Direct-Acting Underground Steam Pumping Machinery. Illust. 8vo. $6 00 =Molesworth.=—Pocket-Book of Useful Formulæ and Memoranda for Civil and Mechanical Engineers. Pocket-book form $1 00 =Moore.=—The Universal Assistant. A Handbook of 1,000,000 Industrial Facts, Processes, Rules, Receipts, etc. With 500 Engravings. 12mo. $2 50 =Morris.=—Easy Rules for the Measurement of Earthworks by means of the Prismoidal Formula. By Elwood Morris, C.E. 8vo. $1 50