DOUGLASS, Prof. S. H., and PRESCOTT, Prof. A. B.—Qualitative Chemical Analysis.

A Guide in the Practical Study of Chemistry, and in the Work of Analysis. Fourth edition. 8vo, cloth 3 50

DUANE, Gen. J. C.—Manual for Engineering Troops.

Consisting of—Part I. Ponton Drill; II. Practical Operations of a Siege; III. School of the Sap; IV. Military Mining; V. Construction of Batteries. With 16 plates and numerous wood-cut illustrations. 12mo, half morocco 1 50

DUBOIS, A. J.—The New Method of Graphical Statics.

With 60 illustrations. 8vo, cloth 1 50

DUFOUR, Gen. G. H.—The Principles of Strategy and Grand Tactics.

Translated from the French, by William P. Craighill, U. S. Engineers, from the last French edition. Illustrated. 12mo, cloth 1 50

DURYEA, Col. A.—Standing Orders of the Seventh Regiment National Guards.

New edition. 16mo, cloth 50