_Nil sapientiæ odiosius acumine nimio._ SENECA. At Paris, just after dark one gusty evening in the autumn of 18--, I was enjoying the twofold luxury of meditation and a meerschaum, in company with my friend, C. Auguste Dupin, in his little back library, or book-closet, _au troisième, No. 33, Rue Dunôt, Faubourg Saint Germain_. For one hour at least we had maintained a profound silence; while each, to any casual observer, might have seemed intently and exclusively occupied with the curling eddies of smoke that oppressed the atmosphere of the chamber. For myself, however, I was mentally discussing certain topics which had formed matter for conversation between us at an earlier period of the evening; I mean the affair of the Rue Morgue, and the mystery attending the murder of Marie Rogêt. I looked upon it, therefore, as something of a coincidence, when the door of our apartment was thrown open and admitted our old acquaintance, Monsieur G----, the Prefect of the Parisian police. We gave him a hearty welcome; for there was nearly half as much of the entertaining as of the contemptible about the man, and we had not seen him for several years. We had been sitting in the dark, and Dupin now arose for the purpose of lighting a lamp, but sat down again without doing so, upon G----'s saying that he had called to consult us, or rather to ask the opinion of my friend, about some official business which had occasioned a great deal of trouble. "If it is any point requiring reflection," observed Dupin, as he forebore to enkindle the wick, "we shall examine it to better purpose in the dark." "This is another of your odd notions," said the Prefect, who had a fashion of calling everything "odd" that was beyond his comprehension, and thus lived amid an absolute legion of "oddities." "Very true," said Dupin, as he supplied his visitor with a pipe, and rolled towards him a comfortable chair. "And what is the difficulty now?" I asked. "Nothing more in the assassination way, I hope?" "Oh, no; nothing of that nature. The fact is, the business is _very_ simple indeed, and I make no doubt that we can manage it sufficiently well ourselves; but then I thought Dupin would like to hear the details of it, because it is so excessively _odd_." "Simple and odd," said Dupin. "Why, yes; and not exactly that, either. The fact is, we have all been a good deal puzzled because the affair _is_ so simple, and yet baffles us altogether." "Perhaps it is the very simplicity of the thing which puts you at fault," said my friend. "What nonsense you _do_ talk!" said the Prefect, laughing heartily. "Perhaps the mystery is a little _too_ plain," said Dupin. "Oh, good heavens! who ever heard of such an idea?" "A little _too_ self-evident." "Ha! ha! ha!--ha! ha! ha!--ho! ho! ho!" roared our visitor, profoundly amused, "O Dupin, you will be the death of me yet!" "And what, after all, _is_ the matter on hand?" I asked.