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Rh in such a way that they will be obeyed cheerfully (and consequently more effectively); he will find it possible to rehearse longer with less fatigue both to himself and to his musical forces; and he will be able to digest his food and to sleep soundly after the rehearsal because he is not worrying over trivial annoyances that, after all, should have been dismissed with a laugh as soon as they appeared. There must not of course be so much levity that the effectiveness of the rehearsal will be endangered, but there is not much likelihood that this will happen; whereas there seems to be considerable danger that our rehearsals will become too cold and formal. A writer on the psychology of laughter states that "laughter is man's best friend"; and in another place (p. 342) says that the smile always brings to the mind "relaxation from strain."

Creative imagination is an inborn quality—"a gift of the gods"—and if the individual does not possess it, very little can be done for him in the artistic realm. Constructive or creative imagination implies the ability to combine known elements in new ways—to use the mind forwards, as it were. The possession of this trait makes it possible to picture to oneself how things are going to look or sound or feel before any actual sense experience has taken place; to see into people's minds and often find out in advance how they are going to react to a projected situation; to combine chemical elements in new ways and thus create new substances; to plan details of organization in a manufacturing establishment or in an educational institution, and to be able to forecast how these things are going to work out.

It is this quality of creative imagination that enables the inventor to project his mind into the future and see a continent spanned by railways and telephones,