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Characters: C. Auguste Dupin

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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 St. 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.”

  “That is another of your odd notions,” said the Prefect, who had
  a fashion of calling every thing “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!” replied 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, “oh, Dupin, you will be the death of me yet!”

  “And what, after all, is the matter on hand?” I asked.

  “Why, I will tell you,” replied the Prefect, as he gave a long,
  steady and contemplative puff, and settled himself in his chair.
  “I will tell you in a few words; but, before I begin, let me
  caution you that this is an affair demanding the greatest
  secrecy, and that I should most probably lose the position I now
  hold, were it known that I confided it to any one.”

  “Proceed,” said I.

  “Or not,” said Dupin.

  “Well, then; I have received personal information, from a very
  high quarter, that a certain document of the last importance has
  been purloined from the royal apartments. The individual who
  purloined it is known; this beyond a doubt; he was seen to take
  it. It is known, also, that it still remains in his possession.”

  “How is this known?” asked Dupin.

  “It is clearly inferred,” replied the Prefect, “from the nature
  of the document, and from the non-appearance of certain results
  which would at once arise from its passing out of the robber’s
  possession; that is to say, from his employing it as he must
  design in the end to employ it.”

  “Be a little more explicit,” I said.

  “Well, I may venture so far as to say that the paper gives its
  holder a certain power in a certain quarter where such power is
  immensely valuable.” The Prefect was fond of the cant of
  diplomacy.

  “Still I do not quite understand,” said Dupin.

  “No? Well; the disclosure of the document to a third person, who
  shall be nameless, would bring in question the honor of a
  personage of most exalted station; and this fact gives the holder
  of the document an ascendancy over the illustrious personage
  whose honor and peace are so jeopardized.”

  “But this ascendancy,” I interposed, “would depend upon the
  robber’s knowledge of the loser’s knowledge of the robber. Who
  would dare—”

  “The thief,” said G., “is the Minister D——, who dares all things,
  those unbecoming as well as those becoming a man. The method of
  the theft was not less ingenious than bold. The document in
  question—a letter, to be frank—had been received by the personage
  robbed while alone in the royal boudoir. During its perusal she
  was suddenly interrupted by the entrance of the other exalted
  personage from whom especially it was her wish to conceal it.
  After a hurried and vain endeavor to thrust it in a drawer, she
  was forced to place it, open as it was, upon a table. The
  address, however, was uppermost, and, the contents thus
  unexposed, the letter escaped notice. At this juncture enters the
  Minister D——. His lynx eye immediately perceives the paper,
  recognises the handwriting of the address, observes the confusion
  of the personage addressed, and fathoms her secret. After some
  business transactions, hurried through in his ordinary manner, he
  produces a letter somewhat similar to the one in question, opens
  it, pretends to read it, and then places it in close
  juxtaposition to the other. Again he converses, for some fifteen
  minutes, upon the public affairs. At length, in taking leave, he
  takes also from the table the letter to which he had no claim.
  Its rightful owner saw, but, of course, dared not call attention
  to the act, in the presence of the third personage who stood at
  her elbow. The minister decamped; leaving his own letter—one of
  no importance—upon the table.”

  “Here, then,” said Dupin to me, “you have precisely what you
  demand to make the ascendancy complete—the robber’s knowledge of
  the loser’s knowledge of the robber.”

  “Yes,” replied the Prefect; “and the power thus attained has, for
  some months past, been wielded, for political purposes, to a very
  dangerous extent. The personage robbed is more thoroughly
  convinced, every day, of the necessity of reclaiming her letter.
  But this, of course, cannot be done openly. In fine, driven to
  despair, she has committed the matter to me.”

  “Than whom,” said Dupin, amid a perfect whirlwind of smoke, “no
  more sagacious agent could, I suppose, be desired, or even
  imagined.”

  “You flatter me,” replied the Prefect; “but it is possible that
  some such opinion may have been entertained.”

  “It is clear,” said I, “as you observe, that the letter is still
  in possession of the minister; since it is this possession, and
  not any employment of the letter, which bestows the power. With
  the employment the power departs.”

  “True,” said G.; “and upon this conviction I proceeded. My first
  care was to make thorough search of the minister’s hotel; and
  here my chief embarrassment lay in the necessity of searching
  without his knowledge. Beyond all things, I have been warned of
  the danger which would result from giving him reason to suspect
  our design.”

  “But,” said I, “you are quite au fait in these investigations.
  The Parisian police have done this thing often before.”

  “Oh, yes; and for this reason I did not despair. The habits of
  the minister gave me, too, a great advantage. He is frequently
  absent from home all night. His servants are by no means
  numerous. They sleep at a distance from their master’s apartment,
  and, being chiefly Neapolitans, are readily made drunk. I have
  keys, as you know, with which I can open any chamber or cabinet
  in Paris. For three months a night has not passed, during the
  greater part of which I have not been engaged, personally, in
  ransacking the D—— Hotel. My honor is interested, and, to mention
  a great secret, the reward is enormous. So I did not abandon the
  search until I had become fully satisfied that the thief is a
  more astute man than myself. I fancy that I have investigated
  every nook and corner of the premises in which it is possible
  that the paper can be concealed.”

  “But is it not possible,” I suggested, “that although the letter
  may be in possession of the minister, as it unquestionably is, he
  may have concealed it elsewhere than upon his own premises?”

  “This is barely possible,” said Dupin. “The present peculiar
  condition of affairs at court, and especially of those intrigues
  in which D—— is known to be involved, would render the instant
  availability of the document—its susceptibility of being produced
  at a moment’s notice—a point of nearly equal importance with its
  possession.”

  “Its susceptibility of being produced?” said I.

  “That is to say, of being destroyed,” said Dupin.

  “True,” I observed; “the paper is clearly then upon the premises.
  As for its being upon the person of the minister, we may consider
  that as out of the question.”

  “Entirely,” said the Prefect. “He has been twice waylaid, as if
  by footpads, and his person rigorously searched under my own
  inspection.”

  “You might have spared yourself this trouble,” said Dupin. “D——,
  I presume, is not altogether a fool, and, if not, must have
  anticipated these waylayings, as a matter of course.”

  “Not altogether a fool,” said G., “but then he’s a poet, which I
  take to be only one remove from a fool.”

  “True,” said Dupin, after a long and thoughtful whiff from his
  meerschaum, “although I have been guilty of certain doggrel
  myself.”

  “Suppose you detail,” said I, “the particulars of your search.”

  “Why the fact is, we took our time, and we searched _everywhere_.
  I have had long experience in these affairs. I took the entire
  building, room by room; devoting the nights of a whole week to
  each. We examined, first, the furniture of each apartment. We
  opened every possible drawer; and I presume you know that, to a
  properly trained police agent, such a thing as a secret drawer is
  impossible. Any man is a dolt who permits a ‘secret’ drawer to
  escape him in a search of this kind. The thing is so plain. There
  is a certain amount of bulk—of space—to be accounted for in every
  cabinet. Then we have accurate rules. The fiftieth part of a line
  could not escape us. After the cabinets we took the chairs. The
  cushions we probed with the fine long needles you have seen me
  employ. From the tables we removed the tops.”

  “Why so?”

  “Sometimes the top of a table, or other similarly arranged piece
  of furniture, is removed by the person wishing to conceal an
  article; then the leg is excavated, the article deposited within
  the cavity, and the top replaced. The bottoms and tops of
  bedposts are employed in the same way.”

  “But could not the cavity be detected by sounding?” I asked.

  “By no means, if, when the article is deposited, a sufficient
  wadding of cotton be placed around it. Besides, in our case, we
  were obliged to proceed without noise.”

  “But you could not have removed—you could not have taken to
  pieces all articles of furniture in which it would have been
  possible to make a deposit in the manner you mention. A letter
  may be compressed into a thin spiral roll, not differing much in
  shape or bulk from a large knitting-needle, and in this form it
  might be inserted into the rung of a chair, for example. You did
  not take to pieces all the chairs?”

  “Certainly not; but we did better—we examined the rungs of every
  chair in the hotel, and, indeed the jointings of every
  description of furniture, by the aid of a most powerful
  microscope. Had there been any traces of recent disturbance we
  should not have failed to detect it instantly. A single grain of
  gimlet-dust, for example, would have been as obvious as an apple.
  Any disorder in the glueing—any unusual gaping in the
  joints—would have sufficed to insure detection.”

  “I presume you looked to the mirrors, between the boards and the
  plates, and you probed the beds and the bed-clothes, as well as
  the curtains and carpets.”

  “That of course; and when we had absolutely completed every
  particle of the furniture in this way, then we examined the house
  itself. We divided its entire surface into compartments, which we
  numbered, so that none might be missed; then we scrutinized each
  individual square inch throughout the premises, including the two
  houses immediately adjoining, with the microscope, as before.”

  “The two houses adjoining!” I exclaimed; “you must have had a
  great deal of trouble.”

  “We had; but the reward offered is prodigious!”

  “You include the grounds about the houses?”

  “All the grounds are paved with brick. They gave us comparatively
  little trouble. We examined the moss between the bricks, and
  found it undisturbed.”

  “You looked among D——‘s papers, of course, and into the books of
  the library?”

  “Certainly; we opened every package and parcel; we not only
  opened every book, but we turned over every leaf in each volume,
  not contenting ourselves with a mere shake, according to the
  fashion of some of our police officers. We also measured the
  thickness of every book-cover, with the most accurate
  admeasurement, and applied to each the most jealous scrutiny of
  the microscope. Had any of the bindings been recently meddled
  with, it would have been utterly impossible that the fact should
  have escaped observation. Some five or six volumes, just from the
  hands of the binder, we carefully probed, longitudinally, with
  the needles.”

  “You explored the floors beneath the carpets?”

  “Beyond doubt. We removed every carpet, and examined the boards
  with the microscope.”

  “And the paper on the walls?”

  “Yes.”

  “You looked into the cellars?”

  “We did.”

  “Then,” I said, “you have been making a miscalculation, and the
  letter is not upon the premises, as you suppose.”

  “I fear you are right there,” said the Prefect. “And now, Dupin,
  what would you advise me to do?”

  “To make a thorough re-search of the premises.”

  “That is absolutely needless,” replied G——. “I am not more sure
  that I breathe than I am that the letter is not at the Hotel.”

  “I have no better advice to give you,” said Dupin. “You have, of
  course, an accurate description of the letter?”

  “Oh yes!”—And here the Prefect, producing a memorandum-book,
  proceeded to read aloud a minute account of the internal, and
  especially of the external appearance of the missing document.
  Soon after finishing the perusal of this description, he took his
  departure, more entirely depressed in spirits than I had ever
  known the good gentleman before.

  In about a month afterwards he paid us another visit, and found
  us occupied very nearly as before. He took a pipe and a chair and
  entered into some ordinary conversation. At length I said,—

  “Well, but G——, what of the purloined letter? I presume you have
  at last made up your mind that there is no such thing as
  overreaching the Minister?”

  “Confound him, say I—yes; I made the re-examination, however, as
  Dupin suggested—but it was all labor lost, as I knew it would
  be.”

  “How much was the reward offered, did you say?” asked Dupin.

  “Why, a very great deal—a very liberal reward—I don’t like to say
  how much, precisely; but one thing I will say, that I wouldn’t
  mind giving my individual check for fifty thousand francs to any
  one who could obtain me that letter. The fact is, it is becoming
  of more and more importance every day; and the reward has been
  lately doubled. If it were trebled, however, I could do no more
  than I have done.”

  “Why, yes,” said Dupin, drawlingly, between the whiffs of his
  meerschaum, “I really—think, G——, you have not exerted
  yourself—to the utmost in this matter. You might—do a little
  more, I think, eh?”

  “How?—in what way?”

  “Why—puff, puff—you might—puff, puff—employ counsel in the
  matter, eh?—puff, puff, puff. Do you remember the story they tell
  of Abernethy?”

  “No; hang Abernethy!”

  “To be sure! hang him and welcome. But, once upon a time, a
  certain rich miser conceived the design of spunging upon this
  Abernethy for a medical opinion. Getting up, for this purpose, an
  ordinary conversation in a private company, he insinuated his
  case to the physician, as that of an imaginary individual.

  “‘We will suppose,’ said the miser, ‘that his symptoms are such
  and such; now, doctor, what would you have directed him to take?’

  “‘Take!’ said Abernethy, ‘why, take advice, to be sure.’”

  “But,” said the Prefect, a little discomposed, “I am perfectly
  willing to take advice, and to pay for it. I would really give
  fifty thousand francs to any one who would aid me in the matter.”

  “In that case,” replied Dupin, opening a drawer, and producing a
  check-book, “you may as well fill me up a check for the amount
  mentioned. When you have signed it, I will hand you the letter.”

  I was astounded. The Prefect appeared absolutely
  thunder-stricken. For some minutes he remained speechless and
  motionless, looking incredulously at my friend with open mouth,
  and eyes that seemed starting from their sockets; then,
  apparently recovering himself in some measure, he seized a pen,
  and after several pauses and vacant stares, finally filled up and
  signed a check for fifty thousand francs, and handed it across
  the table to Dupin. The latter examined it carefully and
  deposited it in his pocket-book; then, unlocking an escritoire,
  took thence a letter and gave it to the Prefect. This functionary
  grasped it in a perfect agony of joy, opened it with a trembling
  hand, cast a rapid glance at its contents, and then, scrambling
  and struggling to the door, rushed at length unceremoniously from
  the room and from the house, without having uttered a syllable
  since Dupin had requested him to fill up the check.

  When he had gone, my friend entered into some explanations.

  “The Parisian police,” he said, “are exceedingly able in their
  way. They are persevering, ingenious, cunning, and thoroughly
  versed in the knowledge which their duties seem chiefly to
  demand. Thus, when G—— detailed to us his mode of searching the
  premises at the Hotel D——, I felt entire confidence in his having
  made a satisfactory investigation—so far as his labors extended.”

  “So far as his labors extended?” said I.

  “Yes,” said Dupin. “The measures adopted were not only the best
  of their kind, but carried out to absolute perfection. Had the
  letter been deposited within the range of their search, these
  fellows would, beyond a question, have found it.”

  I merely laughed—but he seemed quite serious in all that he said.

  “The measures, then,” he continued, “were good in their kind, and
  well executed; their defect lay in their being inapplicable to
  the case, and to the man. A certain set of highly ingenious
  resources are, with the Prefect, a sort of Procrustean bed, to
  which he forcibly adapts his designs. But he perpetually errs by
  being too deep or too shallow for the matter in hand; and many a
  schoolboy is a better reasoner than he. I knew one about eight
  years of age, whose success at guessing in the game of ‘even and
  odd’ attracted universal admiration. This game is simple, and is
  played with marbles. One player holds in his hand a number of
  these toys, and demands of another whether that number is even or
  odd. If the guess is right, the guesser wins one; if wrong, he
  loses one. The boy to whom I allude won all the marbles of the
  school. Of course he had some principle of guessing; and this lay
  in mere observation and admeasurement of the astuteness of his
  opponents. For example, an arrant simpleton is his opponent, and,
  holding up his closed hand, asks, ‘are they even or odd?’ Our
  schoolboy replies, ‘odd,’ and loses; but upon the second trial he
  wins, for he then says to himself, ‘the simpleton had them even
  upon the first trial, and his amount of cunning is just
  sufficient to make him have them odd upon the second; I will
  therefore guess odd;’—he guesses odd, and wins. Now, with a
  simpleton a degree above the first, he would have reasoned thus:
  ‘This fellow finds that in the first instance I guessed odd, and,
  in the second, he will propose to himself, upon the first
  impulse, a simple variation from even to odd, as did the first
  simpleton; but then a second thought will suggest that this is
  too simple a variation, and finally he will decide upon putting
  it even as before. I will therefore guess even;’—he guesses even,
  and wins. Now this mode of reasoning in the schoolboy, whom his
  fellows termed ‘lucky,’—what, in its last analysis, is it?”

  “It is merely,” I said, “an identification of the reasoner’s
  intellect with that of his opponent.”

  “It is,” said Dupin; “and, upon inquiring of the boy by what
  means he effected the thorough identification in which his
  success consisted, I received answer as follows: ‘When I wish to
  find out how wise, or how stupid, or how good, or how wicked is
  any one, or what are his thoughts at the moment, I fashion the
  expression of my face, as accurately as possible, in accordance
  with the expression of his, and then wait to see what thoughts or
  sentiments arise in my mind or heart, as if to match or
  correspond with the expression.’ This response of the schoolboy
  lies at the bottom of all the spurious profundity which has been
  attributed to Rochefoucault, to La Bougive, to Machiavelli, and
  to Campanella.”

  “And the identification,” I said, “of the reasoner’s intellect
  with that of his opponent, depends, if I understand you aright,
  upon the accuracy with which the opponent’s intellect is
  admeasured.”

  “For its practical value it depends upon this,” replied Dupin;
  “and the Prefect and his cohort fail so frequently, first, by
  default of this identification, and, secondly, by
  ill-admeasurement, or rather through non-admeasurement, of the
  intellect with which they are engaged. They consider only their
  own ideas of ingenuity; and, in searching for anything hidden,
  advert only to the modes in which they would have hidden it. They
  are right in this much—that their own ingenuity is a faithful
  representative of that of the mass; but when the cunning of the
  individual felon is diverse in character from their own, the
  felon foils them, of course. This always happens when it is above
  their own, and very usually when it is below. They have no
  variation of principle in their investigations; at best, when
  urged by some unusual emergency—by some extraordinary reward—they
  extend or exaggerate their old modes of practice, without
  touching their principles. What, for example, in this case of
  D——, has been done to vary the principle of action? What is all
  this boring, and probing, and sounding, and scrutinizing with the
  microscope and dividing the surface of the building into
  registered square inches—what is it all but an exaggeration of
  the application of the one principle or set of principles of
  search, which are based upon the one set of notions regarding
  human ingenuity, to which the Prefect, in the long routine of his
  duty, has been accustomed? Do you not see he has taken it for
  granted that all men proceed to conceal a letter,—not exactly in
  a gimlet hole bored in a chair-leg—but, at least, in some
  out-of-the-way hole or corner suggested by the same tenor of
  thought which would urge a man to secrete a letter in a
  gimlet-hole bored in a chair-leg? And do you not see also, that
  such recherchés nooks for concealment are adapted only for
  ordinary occasions, and would be adopted only by ordinary
  intellects; for, in all cases of concealment, a disposal of the
  article concealed—a disposal of it in this recherché manner,—is,
  in the very first instance, presumable and presumed; and thus its
  discovery depends, not at all upon the acumen, but altogether
  upon the mere care, patience, and determination of the seekers;
  and where the case is of importance—or, what amounts to the same
  thing in the political eyes, when the reward is of magnitude,—the
  qualities in question have never been known to fail. You will now
  understand what I meant in suggesting that, had the purloined
  letter been hidden any where within the limits of the Prefect’s
  examination—in other words, had the principle of its concealment
  been comprehended within the principles of the Prefect—its
  discovery would have been a matter altogether beyond question.
  This functionary, however, has been thoroughly mystified; and the
  remote source of his defeat lies in the supposition that the
  Minister is a fool, because he has acquired renown as a poet. All
  fools are poets; this the Prefect feels; and he is merely guilty
  of a non distributio medii in thence inferring that all poets are
  fools.”

  “But is this really the poet?” I asked. “There are two brothers,
  I know; and both have attained reputation in letters. The
  Minister I believe has written learnedly on the Differential
  Calculus. He is a mathematician, and no poet.”

  “You are mistaken; I know him well; he is both. As poet and
  mathematician, he would reason well; as mere mathematician, he
  could not have reasoned at all, and thus would have been at the
  mercy of the Prefect.”

  “You surprise me,” I said, “by these opinions, which have been
  contradicted by the voice of the world. You do not mean to set at
  naught the well-digested idea of centuries. The mathematical
  reason has long been regarded as the reason par excellence.”

  “‘Il y a à parièr,’” replied Dupin, quoting from Chamfort, “‘que
  toute idée publique, toute convention reçue est une sottise, car
  elle a convenue au plus grand nombre.’ The mathematicians, I
  grant you, have done their best to promulgate the popular error
  to which you allude, and which is none the less an error for its
  promulgation as truth. With an art worthy a better cause, for
  example, they have insinuated the term ‘analysis’ into
  application to algebra. The French are the originators of this
  particular deception; but if a term is of any importance—if words
  derive any value from applicability—then ‘analysis’ conveys
  ‘algebra’ about as much as, in Latin, ‘ambitus’ implies
  ‘ambition,’ ‘_religio_’ ‘religion,’ or ‘_homines honesti_’ a set
  of _honorable_ men.”

  “You have a quarrel on hand, I see,” said I, “with some of the
  algebraists of Paris; but proceed.”

  “I dispute the availability, and thus the value, of that reason
  which is cultivated in any especial form other than the
  abstractly logical. I dispute, in particular, the reason educed
  by mathematical study. The mathematics are the science of form
  and quantity; mathematical reasoning is merely logic applied to
  observation upon form and quantity. The great error lies in
  supposing that even the truths of what is called pure algebra,
  are abstract or general truths. And this error is so egregious
  that I am confounded at the universality with which it has been
  received. Mathematical axioms are not axioms of general truth.
  What is true of relation—of form and quantity—is often grossly
  false in regard to morals, for example. In this latter science it
  is very usually untrue that the aggregated parts are equal to the
  whole. In chemistry also the axiom fails. In the consideration of
  motive it fails; for two motives, each of a given value, have
  not, necessarily, a value when united, equal to the sum of their
  values apart. There are numerous other mathematical truths which
  are only truths within the limits of relation. But the
  mathematician argues, from his finite truths, through habit, as
  if they were of an absolutely general applicability—as the world
  indeed imagines them to be. Bryant, in his very learned
  ‘Mythology,’ mentions an analogous source of error, when he says
  that ‘although the Pagan fables are not believed, yet we forget
  ourselves continually, and make inferences from them as existing
  realities.’ With the algebraists, however, who are Pagans
  themselves, the ‘Pagan fables’ are believed, and the inferences
  are made, not so much through lapse of memory, as through an
  unaccountable addling of the brains. In short, I never yet
  encountered the mere mathematician who could be trusted out of
  equal roots, or one who did not clandestinely hold it as a point
  of his faith that x2+px was absolutely and unconditionally equal
  to q. Say to one of these gentlemen, by way of experiment, if you
  please, that you believe occasions may occur where x2+px is not
  altogether equal to q, and, having made him understand what you
  mean, get out of his reach as speedily as convenient, for, beyond
  doubt, he will endeavor to knock you down.

  “I mean to say,” continued Dupin, while I merely laughed at his
  last observations, “that if the Minister had been no more than a
  mathematician, the Prefect would have been under no necessity of
  giving me this check. I know him, however, as both mathematician
  and poet, and my measures were adapted to his capacity, with
  reference to the circumstances by which he was surrounded. I knew
  him as a courtier, too, and as a bold intriguant. Such a man, I
  considered, could not fail to be aware of the ordinary policial
  modes of action. He could not have failed to anticipate—and
  events have proved that he did not fail to anticipate—the
  waylayings to which he was subjected. He must have foreseen, I
  reflected, the secret investigations of his premises. His
  frequent absences from home at night, which were hailed by the
  Prefect as certain aids to his success, I regarded only as ruses,
  to afford opportunity for thorough search to the police, and thus
  the sooner to impress them with the conviction to which G——, in
  fact, did finally arrive—the conviction that the letter was not
  upon the premises. I felt, also, that the whole train of thought,
  which I was at some pains in detailing to you just now,
  concerning the invariable principle of policial action in
  searches for articles concealed—I felt that this whole train of
  thought would necessarily pass through the mind of the Minister.
  It would imperatively lead him to despise all the ordinary nooks
  of concealment. He could not, I reflected, be so weak as not to
  see that the most intricate and remote recess of his hotel would
  be as open as his commonest closets to the eyes, to the probes,
  to the gimlets, and to the microscopes of the Prefect. I saw, in
  fine, that he would be driven, as a matter of course, to
  simplicity, if not deliberately induced to it as a matter of
  choice. You will remember, perhaps, how desperately the Prefect
  laughed when I suggested, upon our first interview, that it was
  just possible this mystery troubled him so much on account of its
  being so very self-evident.”

  “Yes,” said I, “I remember his merriment well. I really thought
  he would have fallen into convulsions.”

  “The material world,” continued Dupin, “abounds with very strict
  analogies to the immaterial; and thus some color of truth has
  been given to the rhetorical dogma, that metaphor, or simile, may
  be made to strengthen an argument, as well as to embellish a
  description. The principle of the vis inertiæ, for example, seems
  to be identical in physics and metaphysics. It is not more true
  in the former, that a large body is with more difficulty set in
  motion than a smaller one, and that its subsequent momentum is
  commensurate with this difficulty, than it is, in the latter,
  that intellects of the vaster capacity, while more forcible, more
  constant, and more eventful in their movements than those of
  inferior grade, are yet the less readily moved, and more
  embarrassed and full of hesitation in the first few steps of
  their progress. Again: have you ever noticed which of the street
  signs, over the shop-doors, are the most attractive of
  attention?”

  “I have never given the matter a thought,” I said.

  “There is a game of puzzles,” he resumed, “which is played upon a
  map. One party playing requires another to find a given word—the
  name of town, river, state or empire—any word, in short, upon the
  motley and perplexed surface of the chart. A novice in the game
  generally seeks to embarrass his opponents by giving them the
  most minutely lettered names; but the adept selects such words as
  stretch, in large characters, from one end of the chart to the
  other. These, like the over-largely lettered signs and placards
  of the street, escape observation by dint of being excessively
  obvious; and here the physical oversight is precisely analogous
  with the moral inapprehension by which the intellect suffers to
  pass unnoticed those considerations which are too obtrusively and
  too palpably self-evident. But this is a point, it appears,
  somewhat above or beneath the understanding of the Prefect. He
  never once thought it probable, or possible, that the Minister
  had deposited the letter immediately beneath the nose of the
  whole world, by way of best preventing any portion of that world
  from perceiving it.

  “But the more I reflected upon the daring, dashing, and
  discriminating ingenuity of D——; upon the fact that the document
  must always have been at hand, if he intended to use it to good
  purpose; and upon the decisive evidence, obtained by the Prefect,
  that it was not hidden within the limits of that dignitary’s
  ordinary search—the more satisfied I became that, to conceal this
  letter, the Minister had resorted to the comprehensive and
  sagacious expedient of not attempting to conceal it at all.

  “Full of these ideas, I prepared myself with a pair of green
  spectacles, and called one fine morning, quite by accident, at
  the Ministerial hotel. I found D—— at home, yawning, lounging,
  and dawdling, as usual, and pretending to be in the last
  extremity of ennui. He is, perhaps, the most really energetic
  human being now alive—but that is only when nobody sees him.

  “To be even with him, I complained of my weak eyes, and lamented
  the necessity of the spectacles, under cover of which I
  cautiously and thoroughly surveyed the whole apartment, while
  seemingly intent only upon the conversation of my host.

  “I paid especial attention to a large writing-table near which he
  sat, and upon which lay confusedly, some miscellaneous letters
  and other papers, with one or two musical instruments and a few
  books. Here, however, after a long and very deliberate scrutiny,
  I saw nothing to excite particular suspicion.

  “At length my eyes, in going the circuit of the room, fell upon a
  trumpery fillagree card-rack of pasteboard, that hung dangling by
  a dirty blue ribbon, from a little brass knob just beneath the
  middle of the mantel-piece. In this rack, which had three or four
  compartments, were five or six visiting cards and a solitary
  letter. This last was much soiled and crumpled. It was torn
  nearly in two, across the middle—as if a design, in the first
  instance, to tear it entirely up as worthless, had been altered,
  or stayed, in the second. It had a large black seal, bearing the
  D—— cipher _very_ conspicuously, and was addressed, in a
  diminutive female hand, to D——, the minister, himself. It was
  thrust carelessly, and even, as it seemed, contemptuously, into
  one of the uppermost divisions of the rack.

  “No sooner had I glanced at this letter, than I concluded it to
  be that of which I was in search. To be sure, it was, to all
  appearance, radically different from the one of which the Prefect
  had read us so minute a description. Here the seal was large and
  black, with the D—— cipher; there it was small and red, with the
  ducal arms of the S—— family. Here, the address, to the Minister,
  diminutive and feminine; there the superscription, to a certain
  royal personage, was markedly bold and decided; the size alone
  formed a point of correspondence. But, then, the radicalness of
  these differences, which was excessive; the dirt; the soiled and
  torn condition of the paper, so inconsistent with the true
  methodical habits of D——, and so suggestive of a design to delude
  the beholder into an idea of the worthlessness of the
  document—these things, together with the hyper-obtrusive
  situation of this document, full in the view of every visitor,
  and thus exactly in accordance with the conclusions to which I
  had previously arrived; these things, I say, were strongly
  corroborative of suspicion, in one who came with the intention to
  suspect.

  “I protracted my visit as long as possible, and, while I
  maintained a most animated discussion with the Minister upon a
  topic which I knew well had never failed to interest and excite
  him, I kept my attention really riveted upon the letter. In this
  examination, I committed to memory its external appearance and
  arrangement in the rack; and also fell, at length, upon a
  discovery which set at rest whatever trivial doubt I might have
  entertained. In scrutinizing the edges of the paper, I observed
  them to be more chafed than seemed necessary. They presented the
  broken appearance which is manifested when a stiff paper, having
  been once folded and pressed with a folder, is refolded in a
  reversed direction, in the same creases or edges which had formed
  the original fold. This discovery was sufficient. It was clear to
  me that the letter had been turned, as a glove, inside out,
  re-directed, and re-sealed. I bade the Minister good morning, and
  took my departure at once, leaving a gold snuff-box upon the
  table.

  “The next morning I called for the snuff-box, when we resumed,
  quite eagerly, the conversation of the preceding day. While thus
  engaged, however, a loud report, as if of a pistol, was heard
  immediately beneath the windows of the hotel, and was succeeded
  by a series of fearful screams, and the shoutings of a terrified
  mob. D—— rushed to a casement, threw it open, and looked out. In
  the meantime, I stepped to the card-rack, took the letter, put it
  in my pocket, and replaced it by a fac-simile, (so far as regards
  externals,) which I had carefully prepared at my
  lodgings—imitating the D—— cipher, very readily, by means of a
  seal formed of bread.

  “The disturbance in the street had been occasioned by the frantic
  behavior of a man with a musket. He had fired it among a crowd of
  women and children. It proved, however, to have been without
  ball, and the fellow was suffered to go his way as a lunatic or a
  drunkard. When he had gone, D—— came from the window, whither I
  had followed him immediately upon securing the object in view.
  Soon afterwards I bade him farewell. The pretended lunatic was a
  man in my own pay.”

  “But what purpose had you,” I asked, “in replacing the letter by
  a fac-simile? Would it not have been better, at the first visit,
  to have seized it openly, and departed?”

  “D——,” replied Dupin, “is a desperate man, and a man of nerve.
  His hotel, too, is not without attendants devoted to his
  interests. Had I made the wild attempt you suggest, I might never
  have left the Ministerial presence alive. The good people of
  Paris might have heard of me no more. But I had an object apart
  from these considerations. You know my political prepossessions.
  In this matter, I act as a partisan of the lady concerned. For
  eighteen months the Minister has had her in his power. She has
  now him in hers—since, being unaware that the letter is not in
  his possession, he will proceed with his exactions as if it was.
  Thus will he inevitably commit himself, at once, to his political
  destruction. His downfall, too, will not be more precipitate than
  awkward. It is all very well to talk about the facilis descensus
  Averni; but in all kinds of climbing, as Catalani said of
  singing, it is far more easy to get up than to come down. In the
  present instance I have no sympathy—at least no pity—for him who
  descends. He is that monstrum horrendum, an unprincipled man of
  genius. I confess, however, that I should like very well to know
  the precise character of his thoughts, when, being defied by her
  whom the Prefect terms ‘a certain personage’ he is reduced to
  opening the letter which I left for him in the card-rack.”

  “How? did you put any thing particular in it?”

  “Why—it did not seem altogether right to leave the interior
  blank—that would have been insulting. D——, at Vienna once, did me
  an evil turn, which I told him, quite good-humoredly, that I
  should remember. So, as I knew he would feel some curiosity in
  regard to the identity of the person who had outwitted him, I
  thought it a pity not to give him a clue. He is well acquainted
  with my MS., and I just copied into the middle of the blank sheet
  the words—

  “‘— — Un dessein si funeste,
  S’il n’est digne d’Atrée, est digne de Thyeste.

  They are to be found in Crébillon’s ‘Atrée.’”