[23] Each station should have its characteristic signal or call letter, as Washington, "W," and each operator his personal signal, as Jones, "Jo."

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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

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