Conan Doyle's detective stories would probably never have been written had not Poe first composed "The Murders in the Rue Morgue"; and the stories of horror and fear so common to-day are possible because Poe wrote "William Wilson," "The Black Cat," and other stories of the same kind. Have you ever learned to scan poetry? If you have, you know that the rules which tell you that a foot is composed of one long syllable and one short one, two short syllables and one long one, or whatever else it may be, are frequently disregarded. You know, too, that some lines are cut off short at the end, and others are made a little too long. Why is this permitted? In his "Rationale of Verse," Poe explained all these things, and showed how the learned of past ages had made mistakes. In a subsequent chapter we shall see just what the relation between music and poetry is, and what Poe taught about the art of making poetry. For years people thought that Poe's "The Philosophy of Composition," in which he tells in what a cold-blooded way he wrote "The Raven," was a joke; but in later times we have learned to understand what he meant and to know that he was very sensible in his methods of working. When Poe was young he was not a very remarkable poet; but, as years went on and he learned more and more the art of writing, he rewrote and rewrote his verses until at last in conscious art he was almost, if not quite, the master poet of America. CHAPTER II POE'S FATHER AND MOTHER Edgar Allan Poe was descended on his father's side from a Revolutionary hero, General David Poe. The Poes were a good family of Baltimore, where many of them still live as prominent citizens. It is said that General Poe was descended from one of Cromwell's officers, who received grants of land in Ireland. One of the poet's ancestors, John Poe, emigrated from Ireland to Pennsylvania; and from there the Poes went to Maryland. General Poe was an ardent patriot both before and during the Revolution. General Poe's son David, the eldest, was not much like his father. In Baltimore he enjoyed himself with his friends and played at amateur theatricals with the Thespian Club. He was supposed to be studying law. For this purpose he went to live with an uncle in Augusta, Georgia; but his father soon heard that he had given up law to become an actor. General Poe was very angry and after that allowed the young man to shift for himself. Edgar Allan Poe's mother was an English actress, whose mother had also been an actress. She was born at sea, and as she went with her mother on her travels from town to town, naturally the daughter learned the mother's art as a means of self-support, and in time became very successful.