During the fourteen years that he occupied the chair of history and political economy at Columbia College, in the city of New York, Francis Lieber displayed praiseworthy activity. This period of his life covered some restless years; the theatre of operations was of a size whose equal can be shown by few historical dramas. Terrorstricken, the civilized world witnessed a tremendous struggle, whence, fortunately, the cause of civilization was to issue triumphant. The learned professor did not content himself with zealously performing his university obligations; neither was he satisfied with fulfilling his civic duties; he threw himself resolutely into the conflict; he fought with his tongue and his pen; he made himself the organizer and representative of a ceaseless propaganda for the Union cause against the secessionists; by his advice and by his legal works he gave the Federal Government the most valuable assistance. For a long time he had been occupied with public law; he now enlarged the field of his researches and his studies, and he studied ardently the laws of war and important problems of international law. The serious events taking place before his eyes led him, too, to write his opinions and to draft The instructions for the government of armies of the United States in the field, which will ever be an honor to him.