interest in the politics of the day which we often find in people less studious of literature and science. Raimond Lullo, the Oriental missionary, continued to write many volumes in the midst of the most continual difficulties and dangers, preserving as much mental energy and clearness as if he had been safe and tranquil in a library. Giordano Bruno worked constantly also in the midst of political troubles and religious persecutions, and his biographer tells us that "il desiderio vivissimo della scienza aveva ben più efficacia sull' animo del Bruno, che non gli avvenimenti esterni." These examples which have just occurred to me, and many others that it would be easy to collect, may be taken to prove at least so much as this, that it is possible to be absorbed in private studies when surrounded by the most disturbing influences; but even in these cases it would be a mistake to conclude that the surroundings had no effect whatever. There can be no doubt that Geoffroy St. Hilaire was intensely excited by the siege of Alexandria, though he may not have attributed his excitement to that cause. His mind was occupied with the electrical fishes, but his nervous system was wrought upon by the siege, and kept in that state of tension which at the same time enabled him to get through a gigantic piece of intellectual labor and made him incapable of rest. Had this condition been prolonged it must have terminated either in exhaustion or in madness. Men have often engaged in literature or science to escape the pressure of anxiety, which strenuous mental labor permits us, at least temporarily, to forget; but the circumstances which surround us have invariably an influence of some kind upon our thinking, though the connection may not be obvious. Even in the case of Goethe, who could study optics on a battle-field, his English biographer recognizes the effect of the Frankfort life which surrounded the great author in his childhood. "The old Frankfort city, with its busy crowds, its fairs, its mixed population, and its many sources of excitement, offered great temptations and great pasture to so desultory a genius. This is perhaps a case wherein circumstances may be seen influencing the direction of character.... A large continuity of thought and effort was perhaps radically uncongenial to such a temperament; yet one cannot help speculating whether under other circumstances he might not have achieved it. Had he been reared in a quiet little old German town, where he would have daily seen the same faces in the silent streets, and come in contact with the same characters, his culture might have been less various, but it might perhaps have been deeper. Had he been reared in the country, with only the changing seasons and the sweet serenities of nature to occupy his attention when released from study, he would certainly have been a different poet. The long summer afternoons spent in lonely rambles, the deepening twilights filled with shadowy visions,