_The Examination and Review Lessons._ In the establishment of habits, the development of appreciation, or the growth in understanding which we seek to secure through thinking, there will be many occasions for checking up our work. Successful teaching requires that the habit that we think we have established be called for and additional practice given from time to time in order to be certain that it is fixed. In like manner, the development of our thought in any field is not something which is accomplished without respect to later neglect. We, rather, build a system of thought with reference to a particular field or subject as a result of thinking, and rethinking through the many different situations which are involved. In like manner, in the field of appreciation the very essence of our enjoyment is to be found in the fact that that which we have enjoyed we recall, and strengthen our appreciation through the revival of the experience. The review is, of course, most successful when it is not simply going over the whole material in exactly the same way. In habit formation it is often advisable to arrange in a different order the stimuli which are to bring the desired responses, for the very essence of habit formation is found in the fact that the particular response can be secured regardless of the order in which they are called for. In thinking, as a subject is developed, our control is measured by the better perspective which we secure. This means, of course, that in review we will not be concerned with reviving all of the processes through which we have passed, but, rather, in a reorganization quite different from that which was originally provided.