opens out over Pennsylvania Avenue, and the hum and bustle of thronging life comes floating up from below; a roar of drums is growing louder every minute, and presently bursts upon the ear as though, just issuing from a neighboring street, the drummers were marching forth upon the avenue. Abbot glances at his patient, fearful lest the noise should wake him, but he sleeps the sleep of exhausted nature, and the soldier in his temporary nurse prompts him to steal to the window and look down upon the troops. They are marching south, along Fourteenth Street--a regiment going over to the fortifications beyond the Long Bridge, and, after a glance, Abbot steps quickly back. On the table nearest the window lies a dainty writing-case, a woman's, and the flap is down on a half-finished letter. On the letter, half disclosed, is the photograph of an officer. It is strangely familiar as Abbot steps towards it. Then--the roar of the drums seems deafening; the walls of the little room seem turning upside down; his brain is in some strange and sudden whirl; but there in his hands he holds, beyond all question--his own picture--a photograph by Brady, taken when he was in Washington during the previous summer. He has not recovered his senses when there is an uneasy movement at the bed. The gray-haired patient turns wearily and throws himself on the other side, and now, though haggard and worn with suffering, there is no forgetting that sorrow-stricken old face. In an instant Major Abbot has recognized his visitor of the week before. There before him lies Doctor Warren. Who--_who_ then is _she_? VI.