Of all the writings on theory and aesthetics--ancient, medieval, or modern--the most important is indisputably Aristotle's Poetics, the first philosophical treatise to propound a theory of literature. In the Poetics, Aristotle writes that he will speak of comedy--but there is no further mention of comedy. Aristotle writes also that he will address catharsis and an analysis of what is funny. But he does not actually address any of...