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Iron Truss Bridges for Railroads. The method of calculating strains in Trusses, with a careful comparison of the most prominent Trusses, in reference to economy in combination, etc., etc. By Brevet. Col. William E. Merrill, U S. A., Major Corps of Engineers, with nine lithographed plates of Illustrations. 4to, cloth... WHIPPLE. An Elementary and Practical Treatise on Bridge Building. An enlarged and improved edition $5.00 15 00 5 00 5 00 4 00 THE KANSAS CITY BRIDGE. With an account of the Regimen of the Missouri River, and a description of the methods used for Founding in that River. By O. Chanute, Chief Engineer, and George Morrison, Assistant Engineer. 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From the last German edition, revised and enlarged. By Prof. Th. Richter, of the Royal Saxon Mining Academy. Translated by Prof. H. B. Cornwall, Assistant in the Columbia School of Mines, New York assisted by John H. Caswell. Illustrated with 87 wood cuts, and one lithographic plate. Second edition, revised, 560 pages, 8vo, cloth.... PLYMPTON. The Blow Pipe. A system of Instruc- ed for the use of Academies, Colleges and High 7 50 2. 00 3 00 ELIOT AND STORER. A compendious Manual of MITCHELL. A Manual of Practical Assaying. By New and Revised 2 25 4 50 10 00 2 00 edition complete in 6 vols. 8vo cloth, $62.00 Supplementary volume sold separately. Price, cloth... 9 00 RANDALL. Quartz Operators Hand-Book. By P. M. Randall. New edition, revised and enlarged, fully illustrated. 12mo, cloth.... SILVERSMITH. 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