To these deep cravings of the heart must be added another of major importance. I mean aspiration, the deep desire of all human without exception sometimes to be better, nobler, finer, truer. Stories of daring in the face of unconquerable odds, stories of devotion, above all stories of self-sacrifice are made to gratify this emotion. They are purges for the restless soul. Some critic of our short story discovered not long ago that the bulk of the narratives chosen for reprinting had self-sacrifice as theme. This is precisely what one would expect of comfortable, ease-loving peoples, like the Germans before the empire and the Americans of our generation. When no real sacrifice of goods, of energy, of love, or of life is necessary, then the craving for stories of men who give up all and women who efface themselves is particularly active. The hard, individualistic stories of selfish characters-- Ben Hecht's for example, and Scott Fitzgerald's--have been written after a war period of enforced self-sacrifice and by young men who were familiar with suffering for a cause. But most American readers of our generation live easily and have always lived easily, and that undoubtedly accounts for the extraordinary popularity here of aspiring books. Reading of a fictitious hero who suffers for others is a tonic for our conscience, and like massage takes the place of exercise. By a twist in the same argument, it may be seen that the cheerful optimist in fiction, who Pollyannawise believes all is for the best, satisfies the craving to justify our well-being. I do not, however, mean to disparage this element of popularity. It is after all the essential quality of tragedy where the soul rises above misfortune. It is a factor in noble literature as well as in popular success. So much for some of the typical and instinctive cravings which cry for satisfaction and are the causes of popularity. To them may be added others of course, notably the desire for sudden wealth, which is a factor in "Treasure Island" as in all treasure stories, and the prime cause of success in the most popular of all plots, the tale of Cinderella, which, after passing through feudal societies with a prince's hand as reward, changed its sloven sister for a shopgirl and King Cophetua into a millionaire, and swept the American stage. To this may also be added simpler stimulants of instinctive emotion, humor stirring to pleasant laughter, pathos that exercises sympathy, the happy ending that makes for joy. Stories which succeed because they stir and satisfy in this fashion are like opera in a foreign tongue, which moves us even when we do not fully understand the reason for our emotion. They differ from another kind of popular story, in which a popular idea rather than an instinctive emotion is crystallized, and which now must be considered.