46 HAND-BOOK OF WASHINGTON. The War Department building occupies the north-west corner of the President’s Square, and is precisely simila-r in design to the State Depart ment. It is the head-quarters of all the officers of the Arm}', and the main-spring of all the military movements. This department comprises in its economy the War Office proper, the Quar termaster’s Department, the Engineer’s Depart ment, Bureau of Topographical Engineers, Ord nance Office, Subsistence Department, Pay De partment, Medical Department, Office of Adjutant General and the head-quarters of the Major Gene ral or military Commander-in-Chief of the Army. The number of persons employed in this depart ment exclusive of the Secretary and Officers of the Army is as follows:—clerks, 92; messengers, 10; and watchmen, 5. Besides the many ac complished and distinguished officers connected with the departments already mentioned, are those also employed in the field, belonging to the 1st and 2d Regiments of Dragoons, to the Regiment of Mounted Riflemen, to the 1st, 2d, 3d and 4th Regiments of Artillery, and to the 8th Regiment of Infantry. The War Department is furnished with a valuable library of some 10,000 volumes, where may be seen, by the curious in such mat ters, an interesting collection of American medals