imaginative vision, and creative insight are not to be explained. But knowledge too, acquired learning and skill, plays its part, and to recognize its function and service is to be helped to a fuller understanding of the achievement of the artist. Gifted with a vibrant, sensitive temperament, endowed with discriminating and organizing power of mind, equipped with a knowledge of the science and the mechanics of his craft, and trained to skill in manual execution, the artist responds to the impulse of his inspiration. His subject is before him. But what is his subject? A scene in nature furnishes him the objective base of his picture, but properly his work is the expression of what he feels. A storm may convey to different men entirely different impressions. In its presence one man may feel himself overwhelmed with terror. These wild, black skies piling in upon him, the hilltops that seem to race through the clouds, the swaying, snapping trees, the earth caught up in the mad grasp of the tempest, may smite his soul with the pitilessness of nature and her inexorable blind power. Another thrills with joy in this cosmic struggle, the joy of conflict which he has known in his own life, the meeting of equal forces in fair fight, where the issue is still doubtful and victory will fall at last upon the strong, though it is not the final triumph but the present struggle that makes the joy. In rendering the "subject" upon his canvas, by the manipulation of composition and line and mass and color, he makes the storm ominous and terrible, or glorious, according as he feels. The import of his picture is not the natural fact of the storm itself, but its significance for the emotions.