Officers of Brigade of Horse Artillery, near Fair Oaks, June, 1862, S.434, S.639. General Stoneman, General Naglee, and staff officers, near Fair Oaks, June, 1862, S.436, S.438, S.445. Gun captured by Butterfield's brigade, near Hanover Court House, S.2353, S.2354. Mechanicsville, Va., S.909. Elliston's Mill, battlefield of Mechanicsville, S.920. Gaines's Mill, Va., S.932. Battlefield of Gaines's Mill, Va., unburied dead, S.914, S.916. Engineer Corps making corduroy roads, June, 1862, S.656. Bridge across Chickahominy River, built by Fifteenth New York Engineers, S.489. Grape Vine Bridge across Chickahominy River, L.7383. Bridge across Chickahominy River, S.930. Bridge across Chickahominy River, Mechanicsville Road, S.913. Telegraph station, Wilcox's Landing, S.2351. Westover House, James River, S.2334, S.2335. Westover Landing, James River, S.620. Officers of Third and Fourth Pennsylvania Cavalry, Westover Landing, S.623, S.629. General W. W. Averell and staff, Westover Landing, S.635. Headquarters of Signal Corps camp at Harrison's Landing, S.621. General Sedgwick, Colonel Sackett, and Lieutenant-Colonel Colburn, Harrison's Landing, August, 1862, S.653. Group of officers that graduated in class of 1860, United States Military Academy, Harrison's Landing, August, 1862, S.624. Major Myers, Lieutenant Stryker, and Lieutenant Norton, Harrison's Landing, August, 1862, S.626. Group of officers belonging to Irish brigade, Harrison's Landing, July, 1862, S.627. Lieutenants Jones, Bowen, and Custer, May, 1862, S.387. * * * * * ARMY OF POTOMAC. JULY, 1862, TO SEPTEMBER, 1862. _Pope's Campaign._ =Centreville, after its evacuation by confederate army in March, 1862:= --confederate barracks, L.7212, S.331, S.332, S.648, S.1045. --confederate fortifications, S.305, S.334, S.333, S.1144, S.1145. --headquarters of (confederate) General Johnston, S.303. =Manassas, after its evacuation by confederate army in March, 1862:= --destruction of railroad, L.7197. --confederate fortifications, L.7171, S.323, S.543, S.544, S.545, S.546. Yellow hospital, Manassas, July, 1862, S.650. Headquarters of General McDowell, near Manassas, July, 1862, S.646, S.647. Our photographer, near Manassas, July, 1862, S.651. =Battlefield of Cedar Mountain:= --general views, S.500, S.506, S.511. --west view of the field, S.504. --dead horses, S.510. --house in which General Winder (confederate) was killed, S.501, S.502. --house used as confederate hospital, S.507. --Mrs. Hudson's house, S.505. --Slaughter's house, position of confederate battery, S.508. Federal battery fording a tributary of the Rappahannock River on day of battle of Cedar Mountain, S.520. Hazel River, S.521. =Culpeper, Va.:= --general views of town, S.216, S.527, S.530. --court-house, S.523. --railroad depot, S.528, S.529. --street views, S.524, S.525, S.526.