=ORDNANCE AND GUNNERY.= For the use of the Cadets of the U. S. Military Academy. By Captain Henry Metcalf, Ordnance Department, U. S. Army Instructor of Ordnance and Gunnery, U.S.M.A. 12mo, 500 pp., cloth, with separate atlas containing 350 cuts, $5.00 =MODERN FRENCH ARTILLERY.= The St. Chamond, De Bange, Canet and Hotchkiss systems, with Illustrations of French War Ships. By James Dredge. 4to, half morocco, $20.00 _net_ =HANDBOOK OF PROBLEMS IN DIRECT FIRE.= By James M. Ingalls, Captain First Artillery, U. S. A. 8vo, cloth, $4.00 =BALLISTIC TABLES.= Reprinted from the Handbook for West Point Cadets. By Capt. Jas. M. Ingalls. 8vo, cloth, $1.50 =SUBMARINE MINES AND TORPEDOES.= As applied to Harbour Defense. By John Townsend Bucknill, Honorary Lieutenant-Colonel (late Major Royal Engineers) Reserve of Officers. With illustrations. 8vo, cloth, $4.00 =PRACTICAL SEAMANSHIP.= By John Todd, Master Mariner, and W. B. Whall, Extra Master Younger Brother Trinity House. Royal 8vo, full cloth, with 243 Illustrations and Diagrams, $7.50 =NOTES ON MILITARY HYGIENE.= For Officers of the Line. A Syllabus of Lectures at the U. S. Infantry and Cavalry School. By Alfred A. Woodhull, Major of Medical Dep’t, Bvt. Lt. Col. U. S. Army. 12mo, morocco, $2.50 =SIMPLE ELEMENTS OF NAVIGATION.= By Lucien Young, U. S. Navy. Pocket-book form, $2.00 =THE SOLDIERS' FIRST AID HANDBOOK.= Comprising a Series of Lectures to Members of the Hospital Corps and Company Bearers. By William D. Dietz, Late Captain and Assistant Surgeon, U. S. Army. 18mo, morocco, $1.25 =PERMANENT FORTIFICATIONS.= By Prof. D. H. Mahan, Revised and brought up to date by Col. James Mercur, U. S. Military Academy, West Point. Numerous plates, 1887. 8vo, half morocco, $7.50 =ELEMENTS OF THE ART OF WAR.= By James Mercur, Professor of Civil and Military Engineering, United States Military Academy. Illustrated with full-page and folding plates. Third edition. 8vo, cloth, $4.00 =PRACTICAL MARINE SURVEYING.= By Harry Phelps, U. S. Navy. 8vo, cloth, $2.50 =“WRINKLES” IN PRACTICAL NAVIGATION.= By S. T. S. Lecky, Master Mariner, Commander R. N. R. Second edition. 80 illustrations. 8vo, cloth, $6.00 =AN ABRIDGEMENT OF MILITARY LAW.= By Lt. Col. W. Winthrop, Deputy Judge Advocate-General U. S. Army, late Professor of Law, U. S. Military Academy. Second and revised edition. 12mo, red cloth, $2.50