"Knowing" in each case involves observation and judgment, and that means verbal images. Students whose power of concrete imagery is low do, on the average, in situations where a concrete image would supposedly help, just as well as students whose power in this field is high. It does seem to be true that object images give a vividness and color to mental life which may result in a keener appreciation of certain types of literature. This warmth and vividness which object images add to the mental processes of those who have them is a boon. On the whole, then, word images are the more valuable of the two types. Upon them depends, primarily, the ability to handle new situations, and even in the constructive fields they are all sufficient. These two facts, added to the fact that they are more accurate, speedy, and general in application, makes them a necessary part of the mental equipment of an efficient worker, and means that much more attention must be given to the development of productive symbol images. Two warnings should be borne in mind: First, although the object images are not necessary in general, as discussed above, to any given individual, because of his particular habits of thought, they may be necessary accompaniments to his mental processes. Second, although object images may not help in giving understanding or appreciation under new conditions, still the method of asking students to try to image certain conditions is worth while because it makes them stop and think, which is always a help. Whether they get object or word images in the process makes no difference. The discussion concerning the possibility of "imageless" thought, while an interesting one, cannot be entered into here. Whether "meanings" can exist in the human mind apart from any carrier in the form of some sensory or imaginal state is unsettled, but the discussion has drawn attention to at least the very fragmentary nature of those carriers. A few fragments of words, a mental shrug of the shoulder, a feeling of the direction in which a certain course is leading, a consciousness of one's attitude towards a plan or person--and the conclusion is reached. The thinking, or it may even have been reasoning, involved few clear-cut images of any kind. The fragmentary, schematic nature of the carriers and the large part played by feelings of direction and attitude are the rather astonishing results of the introspective analysis resulting from this discussion. This sort of thinking is valuable for the same reasons that thinking in terms of words is valuable--it only goes a step further, but it needs direction and training.