The chief office of the teacher, in controlling the pupils' process of learning, being to direct their self-activity in making a selection of ideas from their former knowledge which shall stand in vital connection with the problem, and lead finally to its solution, the question arises in what form the teacher is to conduct the process in order to obtain this desired result. Three different modes of directing the selecting activity of the student are recognized and more or less practised by teachers. These are usually designated the lecture method, the text-book method, and the developing method. THE LECTURE METHOD =Example of Lecture Method.=--In the lecture method so-called, the teacher tells the students in direct words the facts involved in the new problem, and expects these words to enable the pupils to call up from their old knowledge the ideas which will give the teacher's words meaning, and thus lead to a solution of the problem. For example, in teaching the meaning of alluvial fans in geography, a teacher might seek to awaken the interpreting ideas by merely stating in words the characteristic of a fan. This would involve telling the pupils that an alluvial fan is a formation on the floor of a main river valley, resulting from the depositing of detritus carried down the steep side of the valley by a tributary stream and deposited in the form of a fan, when the force of the water is weakened as it enters the more level floor of the valley. To interpret this verbal description, however, the pupil must first interpret the words of the teacher as sounds, and then convert these into ideas by bringing his former knowledge to bear upon the word symbols. If we could take it for granted that the pupil will readily grasp the ideas here signified by such words as, formation, main river valley, depositing, detritus, steep side, etc., and at once feel the relation of these several ideas to the more or less unknown object--alluvial fan--this method would undoubtedly give the pupil the knowledge required.