I use definition in no pedantic sense. I mean, in general, logical definition where the class or _genus_ of the thing to be described--whether best-selling novel or sentimental tendency--is first made clear, and then its _differentia,_ its differences from the type analyzed out and assorted. But this process in literature cannot be as formal as logic. Good literature cannot be bound by formulas. Yet when a poem charged with hot emotion, or a story that strays into new margins of experience, is caught and held until one can compare it with others, see the curve on which it is moving, guess its origin and its aim, forever after it becomes easier to understand, more capable of being thought about and appreciated. And when the current of taste of some new generation that overflows conventions and washes forward, or backward, into regions long unlaved, is viewed as a current, its direction plotted, its force estimated, its quality compared, why that is definition, and some good will come of it. Some general definition of that intellectual emotion which we call good reading is especially needed in America. Most of us, if we are native born, have been educated by a set of literary conventions arranged in convenient categories. That is more or less true of all literary education, but it is particularly true in the United States, where the formal teaching of English literature _per se_ began, where, as nowhere else in the world, there was a great and growing population eager to become literate and with no literary traditions behind it. The student from a bookless home learned to think of his literature as primarily something to be studied; the teacher who had to teach thousands like him was forced to reduce living literature to dead categories in order that a little of it at least should be taught. Thousands of Americans, therefore, of our generation emerged from their training with a set of literary definitions which they assumed to be true and supposed to be culture. Only true definitions of what literature really is can break up such fossilized defining.