It is in a letter to Philip Pendleton Cooke, written in 1846, that Poe disparaged his detective-stories and declared that they "owe most of their popularity to being something in a new key. I do not mean to say that they are not ingenious--but people think them more ingenious than they are--on account of their method and _air_ of method. In the 'Murders in the Rue Morgue,' for instance, where is the ingenuity of unraveling a web which you yourself (the author) have woven for the express purpose of unraveling? The reader is made to confound the ingenuity of the supposititious Dupin with that of the writer of the story." Here, surely, Poe is over-modest; at least he over-states the case against himself. The ingenuity of the author obviously lies in his invention of a web which seemingly cannot be unraveled and which nevertheless one of the characters of the tale, Legrand or Dupin, succeeds in unraveling at last. This ingenuity may be, in one way, less than that required to solve an actual problem in real life; but it is also, in another way, more, for it had to invent its own puzzle and to put this together so that the secret seemed to be absolutely hidden, altho all the facts needed to solve it were plainly presented to the reader. In the same letter to Cooke, Poe remarked on the "wide diversity and variety" of his tales when contrasted one with another; and he asserted that he did not consider any one better than another. "There is a vast variety of kinds, and in degree of value these kinds vary--but each tale is equally good _of its kind_." He added that "the loftiest kind is that of the highest imagination." For this reason only he considered that 'Ligeia' might be called the best of his stories. Now, after a lapse of threescore years, the 'Fall of the House of Usher,' with its "serene and somber beauty," would seem to deserve the first place of all. And among the detective-stories, standing on a lower plane as they do, because they were wrought by invention rather than by the interpreting imagination, the foremost position may be given to the 'Murders in the Rue Morgue.' In this tale Poe's invention is most ingenious and his subject is selected with the fullest understanding of the utmost possibilities of the detective-story. At the core of it is a strange, mysterious, monstrous crime; and M. Anatole France was never wiser than when he declared the unfailing interest of mankind in a gigantic misdeed "because we find in all crimes that fund of hunger and desire on which we all live, the good as well as the bad." Before a crime such as this we seem to find ourselves peering into the contorted visage of primitive man, obeying no law but his own caprice.