Perhaps it is already clear that most popular novels combine many elements of popularity, although usually one is dominant. Among the stories, for instance, which I have mentioned most frequently, "Main Street" depends upon a popular idea, but makes use also of the revenge motive. It is not at all, as many hasty critics said, an appeal to curiosity. We know our Main Streets well enough already. And therefore in England, which also was not curious about Main Streets, and where the popular idea that Sinclair Lewis seized upon was not prevalent, the book has had only a moderate success. "If Winter Comes" combines the revenge motive with aspiration. Scott Fitzgerald's first novel made its strong appeal to curiosity. We had heard of the wild younger generation and were curious. His second book depends largely upon the craving for sex experience, in which it resembles Mr. Hergesheimer's "Cytherea," but also plays heavily upon the motive of escape, and upon sheer curiosity. "Miss Lulu Bett" was a story of revenge. Booth Tarkington's "Alice Adams"--to bring in a new title--is a good illustration of a story where for once a popular novelist slurred over the popular elements in order to concentrate upon a study of character. His book received tardy recognition but it disappointed his less critical admirers. Mr. White's "Andivius Hedulio" depends for its popularity upon curiosity and escape. The popular story, then, the financially successful, the immediately notorious story, should appeal to the instinctive emotions and may be built upon popular prejudice. What is the moral for the writer? Is he to lay out the possible fields of emotion as a surveyor prepares for his blue print? By no means. Unless he follows his own instinct in the plan, or narrates because of his own excited thinking he will produce a thinly clad formula rather than a successful story. There is no moral for the writer, only some rays of light thrown upon the nature of his achievement. The way to accomplish popularity, if that is what you want, is to write for the people, and let formula, once it is understood, take care of itself. As an editor, wise in popularity, once said to me, "Oppenheim and the rest are popular because they think like the people not for them."