THIS photograph is selected from the seven thousand negatives left by Mathew B. Brady, the celebrated government photographer, as one of the most valuable in existence. It seems to be the first instance on the Western Continent, and possibly in the world, in which a camera successfully imprinted on glass the actual vision of a great army in camp. While scenes such as this are engraved on the memories of the venerable warriors who participated in the terrific struggle this remarkable negative preserves for all ages the magnificent pageant of men, who have offered their lives in defense of their country, waiting for the call to the battle-line. The photograph was taken on a day in the middle of May in 1862 when the Army of the Potomac was encamped at Cumberland Landing on the Pamunky River. A hundred thousand men rested in this city of tents, in the seclusion of the hills, eager to strike a blow for the flag they loved, yet such was the tragic stillness that one who recalls it says that absolute quiet reigned throughout the vast concourse like the peace of the Sabbath-day. On every side were immense fields of wheat, promising an abundant harvest, but trammeled under the feet of the encroaching armies. Occasionally the silence was broken by the strains of a national song that swept from tent to tent as the men smoked and drowsed, fearless of the morrow. The encampment covered many square miles and this picture represents but one brigade on the old Custis place, near White House, which became the estate of General Fitzhugh Lee, the indomitable cavalry leader of the Confederacy and an American patriot during the later war with Spain. The original negative, although now forty-five years old, has required but slight retouching in the background. [Illustration]