For four days George kept up with the army, and managed, in spite of burning fevers, of a horrible weakness and weariness, of sleepless nights racked with pain, to ride his horse. On the fifth he was compelled to take to a covered wagon. There, on a rough bed, with Billy holding his burning head, he was jolted along for ten days more, each day more agonizing than the one before. In that terrible time master and man seemed to have changed places. It was George who was fretful and unreasonable and wildly irritable, while Billy, the useless, the lazy, the incorrigible, nursed him with a patience, a tenderness, a strange intelligence that amazed all who saw it, and was even dimly felt by George. The black boy seemed able to do altogether without sleep. At every hour of the day and night he was awake and alert, ready to do anything for the poor sufferer. As the days passed on, and George grew steadily worse, the doctor began to look troubled. In his master’s presence Billy showed no sign of fear, but he would every day follow Dr. Craik when he left, and ask him, with an ashy face: