*HENRICI, OLAUS.--Skeleton Structures, especially in their application to the Building of Steel and Iron Bridges.* With folding plates and diagrams. 8vo, cloth 1 50 *HENRY, GUY V.--Military Record of Civilian Appointments in the United States Army.* 2 vols. 8vo, cloth 10 00 *HETH, Capt. HENRY.--System of Target Practice.* For the Use of Troops when armed with the Musket, Rifle-Musket, Rifle, or Carbine. Prepared principally from the French. 18mo, cloth 50 *HEWSON, WM.--Principles and Practice of Embanking Lands from River Floods, as applied to the Levees of the Mississippi.* 8vo, cloth 2 00 *HOLLEY, ALEXANDER L.--A Treatise on Ordnance and Armor.* Embracing descriptions, discussions, and professional opinions concerning the materials, fabrication, requirements, capabilities, and endurance of European and American Guns, for Naval, Sea-Coast, and Iron-Clad Warfare, and their Rifling, Projectiles, and Breech-Loading; also, results of experiments against armor, from official records, with an appendix referring to Gun-Cotton, Hooped Guns, etc., etc. 948 pages, 493 engravings, and 147 Tables of Results, etc. 8vo, half roan 7 50 Half Russia 10 00 ---- *Railway Practice.* American and European Railway Practice in the economical Generation of Steam, including the Materials and Construction of Coal-burning Boilers, Combustion, the Variable Blast, Vaporization, Circulation, Superheating, Supplying and Heating Feed-water, etc., and the Adaptation of Wood and Coke-burning Engines to Coal-burning; and in Permanent Way, including Road-bed, Sleepers, Rails, Joint-fastenings, Street Railways, etc., etc. With 77 lithographed plates. Folio, cloth 12 00 *HOTCHKISS, JED., and ALLAN, WILLIAM.--The Battle-Fields of Virginia.* Chancellorsville, embracing the Operations of the Army of Northern Virginia, from the First Battle of Fredericksburg to the Death of Lt.-Gen. T. J. Jackson. Illustrated with five maps and portrait of Stonewall Jackson. 8vo, cloth 3 50 *HOWARD, C. R.--Earthwork Mensuration on the Basis of the Prismoidal Formulæ.* Containing simple and labor-saving method of obtaining Prismoidal Contents directly from End Areas. Illustrated by Examples, and accompanied by Plain Rules for Practical Uses. Illustrated. 8vo, cloth 1 50 *HUNTER, Capt. R. F.--Manual for Quartermasters and Commissaries.*