Logic means, simply, the art and method of correct thinking. It is the logy or method of every science, of every discipline and every art; and even music harbors it. It is a science because to a considerable extent the processes of correct thinking can be reduced to rules like physics and geometry, and taught to any normal mind; it is an art because by practice it gives to thought, at last, that unconscious and immediate accuracy which guides the fingers of the pianist over his instrument to effortless harmonies.
