The teacher will need most careful preparation and planning to conduct a review. He must have the entire field to be reviewed fully mastered and in his own mind as a unit, else he cannot lead the child back over it successfully. He must work out a lesson plan which will secure interest and response on the part of his pupils. Many review lessons drag, and are but endured by the class. This may be accounted for by the fact that the review recitation often fails to do more than repeat old material. It may also come from the fact that the children are asked details which they have forgotten or never knew, so that they are unable to take their part. It may in some cases arise from the fact that the teacher is himself not ready for the review, and does not like review days. Whatever may be the cause, the review that fails to catch interest or call forth enthusiasm has in so far failed of its purpose. The minds of teacher and pupils should be at their best and concentration at its keenest for the review lesson. ASSIGNMENT OF LESSON No small part of the success of instruction depends on faithfulness and skill in assigning lessons. Too often this is left for the very last moment of the class hour, when there is no time left for proper assignment and the teacher can give only the most hurried and incomplete directions. Or, it may be that the only direction that is given is the exhortation to "be sure to prepare the lesson for next week." But this will not suffice. We must not forget that children, especially the younger children, may not know just how to go to work upon the lesson, nor what to do in getting it. It is hard for any young child to gather thought from the printed page, even after he has attained fair skill in reading; and it is doubly hard if the matter is difficult or unfamiliar, as is much of the material found in the church-school lessons. How to make the assignment.--In order to assign the lesson properly the teacher must, of course, be perfectly familiar with the coming lesson. This means that he must keep a week ahead in his preparation, which is in the end no loss, but even a gain. The teacher must also have the plan of the lesson sufficiently in mind that he knows just what points are to be stressed, what will present the most difficulty to the class, what will most appeal to their interest, and what will need to be especially assigned for study or investigation. In lessons which children are to prepare at home it is usually well to go over the material briefly with the class in making the assignment, giving hints for study, calling attention to interesting points, and stating very definitely just what the class is expected to do.