Prof. Wm. James says: "Whistling to keep up courage is no mere figure of speech. On the other hand, sit all day in a moping posture, sigh, and reply to everything with a dismal voice, and your melancholy lingers. If we wish to conquer undesirable emotional tendencies in ourselves, we must assiduously, and in the first instance coldbloodedly, go through the outward movements of those contrary dispositions which we wish to cultivate.