*ARNOLD, Maj. FRANK S.--The Discipline and Drill of Militia.* Crown 8vo, limp cloth 2 00 *ATWOOD, Geo.--Practical Blow-Pipe Assaying.* 12mo, cloth, illustrated 2 00 *AUCHINCLOSS, W. S.--Link and Valve Motions Simplified.* Illustrated with 37 wood-cuts and 21 lithographic plates, together with a Travel Scale and numerous useful tables. 8vo, cloth 3 00 *AXON, W. E. A.--The Mechanic's Friend.* A Collection of Receipts and Practical Suggestions Relating to Aquaria--Bronzing--Cements--Drawing--Dyes--Electricity--Gilding-- Glass-working--Glues--Horology--Lacquers--Locomotives--Magnetism-- Metal-working--Modelling--Photography--Pyrotechny--Railways--Solders-- Steam-Engine--Telegraphy--Taxidermy--Varnishes--Waterproofing, and Miscellaneous Tools, Instruments, Machines, and Processes connected with the Chemical and Mechanic Arts. With numerous diagrams and wood-cuts. Fancy cloth 1 50 *BACON, F. W.--A Treatise on the Richards Steam-Engine Indicator, with directions for its use.* By Charles T. Porter. Revised, with notes and large additions as developed by American practice; with an appendix containing useful formulæ and rules for engineers. Illustrated. Fourth edition. 12mo, cloth 1 00 *BARBA, J.--The Use of Steel for Constructive Purposes;* Method of Working, Applying, and Testing Plates and Brass. With a Preface by A. L. Holley, C.E. 12mo, cloth 1 50 *BARNARD, Maj.-Gen. J. G.--The "C. S. A." and the Battle of Bull Run.* 8vo, cloth 1 25 ---- *The Peninsular Campaign and its Antecedents,* As developed by the Report of Maj.-Gen. Geo. B. McClellan and other published Documents. 8vo, cloth 1 00 12mo, paper 30 ---- *Notes on Sea-Coast Defence.* Consisting of Sea-Coast Fortification; the Fifteen-Inch Gun; and Casemate Embrasure. With an engraved plate of the Fifteen-Inch Gun. 8vo, cloth 2 00 *BARNARD, Maj.-Gen. J. G., and BARRY, Maj.-Gen. W. F.--Report of the Engineer and Artillery Operations of the Army of the Potomac,* From its Organization to the Close of the Peninsular Campaign. Illustrated by 18 maps, plans, etc. 8vo, cloth 2 50 *BARNES, Lieut.-Com. JOHN S.--Submarine Warfare, Defensive and Offensive.* Comprising a full and complete History of the invention of the Torpedo, its employment in War, and results of its use. Descriptions of the various forms of Torpedoes, Submarine Batteries, and Torpedo Boats actually used in War. With 20 lithographic plates and many wood-cuts, 8vo, cloth 5 00