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16 The Educational Screen Only directive and suggestive remarks can assist in the pupil's observation, and these had better appear in print on the stereograph. Probably the best method for using the stereograph is to place it with two or three stereoscopes on a table in the corner of the classroom or in the library, where it can be consulted as a reference, just like the dictionary, the encyclo- pedia, or any other source. The teacher may lay out a few correlated views for each lesson, or better, a pupil or two may be given the privilege of selecting them for the use of the class. Any members of the class who go to the table to look at the stereographs, then,' will have a motive for their act. 7. Moving Pictures and Projectors. The moving picture has the unique advantage of depicting action or behavior, with its irresistible illusion of life and reality. But it is a very expensive visual aid, and for that reason should be resorted to only (1) to show activity, which no other pictorial aid can actually portray, and (2) to provide such vicarious experiences as must be brought to us because we can not get them any other way. For schoolroom use, the long strip film will probably never be the vogue. Two to five hundred foot lengths are already taking its place. There is a psychological reason for it: A minute or two is the most effective duration for the utilization of any single visual aid. More than that is intellectual over- feeding, for there must be an assimilation period' in the form of direction, discussion, quizzing, and pupil expression. The difficulty we now have in trying to introduce the moving picture into the classroom is due to the fact that the film in its present form, rather than the teacher, is relentlessly the master of the situation. Perhaps the film of the future will be in the form of a disc or a cylinder. This will enable it to assume the humble position of an aid. If so, its place in the classroom is absolutely assured. The eventual projector is fortunately nearer realization. It will be light, portable like a lantern, and almost equally foolproof. 8. Diagrammatic Moving Pictures. It makes one's imagination dizzy to contemplate the amazing possibilities of the animated drawing. In addition to all the afore-mentioned advantages of the realistic moving picture, it will have the additional one of visualizing the invisible. What this means in the field of science and in all other fields of human endeavor only the future can reveal. Conclusion The most promising soil for the growth of visual education is undoubtedly the elementary school; and the most important function of visual aids is that of being a passive source of information, satisfaction, and inspiration, in the solution of problems and the. execution of pupil projects, s