Imagery, then, is absolutely essential; self-control and social control are dependent upon the distribution of appropriate mental slides. The very life of the nation depends upon this. Here we are, nearly a hundred million people--we always include children--whose slides must be supplied and in some fashion unified. The imagination breaks down at the thought of this vast task. This national like-mindedness is a glorious achievement. It has never been equaled anywhere on the face of the earth. To keep these millions of people, who are scattered over three million square miles, with the same fundamental pictures in their heads is a marvelous triumph. That we are the most progressive, the most mighty, the most highly civilized country on the face of the world--that is a gorgeous colored slide, which we keep on hand all the time. There are a lot of slides like that, that are common to everybody. True, we have slides specialized for the use of various social groups, but the fundamental slides that preserve our nationality, are common to millions. We have to have institutions that keep these slides vivid in the minds of our people. It is the greatest attempt at social control that has ever been conceived. But the national slide industry is by no means perfected. On the whole, there is an appalling number of these pictures that are vulgar slides, cheap slides, commonplace slides, uninteresting slides. It is your business--for now I come to my analogy--it is your business, as the people who are running the moving-picture concerns of the United States, to see to it that better pictures are put into the minds of your fellow citizens. You have the responsibility of superseding in the mental collections of millions of our citizens slides that are cheap and unworthy and inaccurate and misleading, with mental pictures that are clean-cut, trustworthy, informing and inspiring. That is your business. You are in competition with the moving-picture houses. There are nine thousand of these moving-picture concerns working night and day in the United States, filling the minds of people with mental imagery. But every library is full of potential mental pictures which can be made interesting, ennobling and uplifting to millions of people. It is your privilege to get these slides out into circulation, a mighty appealing thing to do, a splendidly stirring thing to do. I hope you are thoroughly alert as members of this mental picture syndicate. You know what you have to do. You must advertise and you must capture the public in every possible way; you must not be ashamed to put out posters describing the wonderful pictures.