The highest endowment of the human spirit on the intellectual side is the power to think. Learning to think is an essential process and end in all school work. Thinking is the intellect's regal activity. In a vague way, all teaching appeals to the thought-activity of the pupil; but vagueness in teaching is as pernicious as it is common. To exhibit the value, scope, and process of thought is of inestimable service to the teacher. It gives specific direction to teaching processes, and saves the child from a thousand fanciful expedients.