Power of Mental Imagery

In the preceding volume of this Course, entitled "The Trained Memory," you learned that the memory process involves four elements, Retention, Recall, Recognition and Imagination; and the scope and operation of two of these elements, Retention and Recall, were explained to you.
There remain Recognition and Imagination, which we shall make the subject of this book. We shall treat of them, however, not only as parts of the memory process, but also as distinct operations, with an individual significance and value.