The Works of Edgar Allan Poe — Volume 4 — Deducibility Analysis
Basic Information
- Author: Edgar Allan Poe
- Year: 1903 (Raven Edition); individual works originally published 1836–1845
- Type: Short story collection (this analysis focuses on works with suspense puzzles and rational mystery structures)
- Detective: No fixed detective; individual works center on unreliable narrators, overconfident bystanders, or purely analytical arguers
- Core mystery types: Object identity puzzle ("The Oblong Box") + identity-reversal puzzle ("The System of Doctor Tarr and Professor Fether") + mechanical deception ("Maelzel's Chess-Player") + physical puzzle ("The Man That Was Used Up")
Overall Deducibility Rating
Of the twenty-three works in this volume, the majority are comedic satire, philosophical dialogue, or Gothic absurdism — pure deductive structure is relatively rare. This analysis selects four works that contain genuine puzzle architecture: "The Oblong Box", "The System of Doctor Tarr and Professor Fether", "Maelzel's Chess-Player", and "The Man That Was Used Up", examined in turn through the deducibility analysis framework.
| Indicator | Rating | Notes |
|---|---|---|
| Deducibility | ⭐⭐⭐ | Average convergence point ~63% — "The Oblong Box" uses the narrator's overconfidence to obscure clues; the identity-reversal puzzle in "Tarr and Fether" plants early warnings within the absurd banquet behavior; "The Man That Was Used Up" signals the answer through repeated conversational interruptions; "Maelzel's Chess-Player" is an analytical essay that announces its conclusion from the very first page |
| Fog Rating | ⭐⭐⭐ | "The Oblong Box" generates the strongest fog through confident misreading; "Tarr and Fether" conceals truth beneath absurdity; "The Man That Was Used Up" generates moderate fog through the social-convention avoidance of a direct answer |
Synopsis
"The Oblong Box" (The Oblong Box, 1844)
The narrator — "I" — is about to board the sailing ship Independence from Charleston to New York. On the passenger list he spots his old friend Cornelius Wyatt — a talented artist — who has booked three cabins for himself, his wife, and his two sisters. The narrator is puzzled by the third cabin, since four people should require only two. When they set sail, a peculiar oblong pine box comes aboard with the party, roughly six feet long and two and a half feet wide, marked: "Adelaide Curtis, Albany, New York — to the care of Mr. Wyatt — to be forwarded upon arrival." The narrator confidently concludes that the box must contain a copy of Leonardo's Last Supper that Wyatt had purchased from the Italian art dealer Nicolino.
During the voyage, "Mrs. Wyatt" proves vulgar and unremarkable — wildly at odds with the beautiful, accomplished woman Wyatt had described — yet each night she mysteriously relocates to the third cabin. Wyatt himself performs some covert ritual with the box every night; lying awake, the narrator hears the sound of the lid being pried open, followed by a low, muffled weeping — which he still attributes to Wyatt admiring his painting. Seven days out, a hurricane cripples the ship. As all passengers are compelled to board the lifeboats, Wyatt alone leaps back onto the sinking vessel, lashes the oblong box to his body with a rope, and sinks with it to the bottom of the sea.
A month later, the narrator encounters the ship's captain on Broadway and learns the truth: Wyatt's real wife had died suddenly on the eve of departure. To transport her remains to New York for delivery to his mother-in-law, he and the captain had made a secret arrangement — the body was packed in salt, placed in a coffin-shaped box, while a maidservant was hired to impersonate the wife. The strange weeping sounds each night were Wyatt opening the coffin lid to mourn his dead wife in silence. "Those things will sink," the captain said, "but when the salt dissolves they'll float" — in the box lay a love too complete to surrender, buried with her in the sea.
"The System of Doctor Tarr and Professor Fether" (The System of Doctor Tarr and Professor Fether, 1845)
The narrator is a young traveler who, while passing through the south of France, arranges to visit a celebrated private lunatic asylum — a château-like estate managed by a Monsieur Maillard. In the drawing room he meets the distinguished Maillard, who explains that the old "soothing system" has been abandoned here and replaced by a new treatment of Maillard's own devising.
The dinner scene fills the narrator with mounting unease: the "attendants and visitors" at the table behave in the most extraordinary fashion — one leaps repeatedly, straining to climb onto the tabletop; one croaks like a frog; one spins incessantly; one shrieks like a rooster. Maillard calmly explains that this is an "immersion therapy" adopted to study the symptoms of mental illness. At that moment, shouts erupt from outside, and a crowd of creatures resembling orangutans smashes through the windows, throwing the banquet into chaos.
Afterward the narrator learns the truth: Maillard himself is a former director of the asylum who went insane three years earlier and became a patient. He organized the patients in a coup against the attendants, had all the real attendants tarred and feathered — that is, doused in tar and stuck with feathers (the "Tarr and Fether" of the title) — and confined them in the cellars for a full month. The "orangutans" who burst through the windows were those escaped attendants. Every supposed "attendant and visitor" at the banquet had been a liberated lunatic.
"Maelzel's Chess-Player" (Maelzel's Chess-Player, 1836)
This is not a work of fiction but a rational analysis in which Poe dismantles the most famous "artificial intelligence spectacle" of nineteenth-century Europe and America — Maelzel's Turk, a mechanical chess-player dressed in Turkish costume, seated cross-legged upon a large cabinet. Since its invention in 1769 the automaton had toured Europe and America, claiming to defeat any human opponent.
Poe opens the essay with an explicit declaration: "The operations of the Automaton are regulated by mind, and by nothing else — and this fact I shall demonstrate by means of strict analysis." He proceeds to enumerate seventeen observations: the sequence in which the cabinet's doors are opened and closed before and after each match; the movement of candlelight inside the cabinet; the asymmetry between the left arm and the right; the automaton's agile response when an opponent makes an irregular move — and more. Poe concludes that a real human chess-player must be concealed inside the cabinet, able to shift hiding positions as Maelzel displays the supposedly empty interior. History confirmed Poe's deduction: a human player — including chess master William Schlumberger — was indeed hidden inside for years.
"The Man That Was Used Up" (The Man That Was Used Up, 1839)
The narrator is captivated by a nameless "something" about Brevet Brigadier General John A. B. C. Smith — a man possessed of remarkably dark hair, incomparable whiskers, perfectly formed shoulders, flawlessly curved calves, and an uncommonly melodious voice. The impression is one of "excessive perfection," a preternatural quality impossible to fault yet impossible to name.
He makes inquiries on every side about Smith's "peculiar something." Each time the answer begins — invariably a glowing tribute to Smith's heroic exploits — it is cut off mid-sentence by some interruption, never reaching a conclusion. Finally the narrator calls on Smith in person, only to find on the bedroom floor a writhing, shapeless thing. He gives it a kick; the thing speaks: "Hem! — ahem! — rather a delicate sort of thing to be sure!"
That thing is General Smith himself. In the campaign against the Bugaboo and Kickapoo Indians he had lost nearly every part of his body: a cork leg (Thomas's patent), a mechanical arm (Bishop's patent), an artificial shoulder (Pettitt's), a false chest (Ducrow's), a palate of lead (De L'Orme's), false teeth (Parmly's), a glass eye (Williams's), an artificial palate (Bonfanti's) — all indispensable. Without these components he is nothing but a small, groaning bundle of black rags on the floor. The "excessive perfection" that had so bewitched the narrator is the seamless assembly of top-of-the-line industrial products.
Truth Analysis
Story One: "The Oblong Box"
Mystery One: What Is in the Box? (whatdunit)
- Clue convergence point: ~68%
- Answer: The box is a coffin containing the body of Wyatt's wife, who died suddenly on the eve of departure. The body was preserved with a large quantity of salt. The wording on the outside of the box and its dimensions were deliberate disguises, intended to prevent other passengers from refusing to sail on the same vessel as a coffin.
Key Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | The box's dimensions: approximately six feet long and two and a half feet wide | ~20% | These are the standard dimensions of a human coffin — a careful reader should become suspicious here rather than accepting the narrator's "painting" hypothesis |
| 2 | The tar paint emits a smell that is "particularly disagreeable" — the narrator calls it "sickening" | ~22% | A large quantity of tar is used to seal a coffin against seepage; paintings are not typically packaged with anything like so much tar |
| 3 | The box is kept in Wyatt's own cabin rather than the cargo hold | ~25% | Works of art are normally placed in the hold; what a person keeps close enough to guard with his own body tends to be a person |
| 4 | Late at night, the narrator hears Wyatt pry open the box with chisel and hammer, the hammerhead muffled in cloth to deaden the sound | ~65% | If it were an oil painting, why muffle the sound? This is an act of mourning, not artistic appreciation |
| 5 | Immediately after the box is opened, "a low sobbing or moaning sound" issues from the cabin | ~66% | Clue convergence point — no interpretation can explain weeping over a painting; at this moment the careful reader can confirm that the box holds the remains of someone beloved |
Supporting Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | "Mrs. Wyatt" is coarse and mediocre in manner — wholly at odds with the beautiful, accomplished wife Wyatt had described | ~35% | Suggests that this woman is not Wyatt's real wife but some kind of substitute |
| 2 | Each night "Mrs. Wyatt" leaves Wyatt's cabin and retires alone to the third cabin | ~60% | "They are effectively living apart" — the narrator assumes marital discord; in fact the maidservant is simply returning to her own cabin |
| 3 | As the ship is about to sink, Wyatt refuses to abandon it, frantically demands to keep the box, and finally lashes it to himself with a rope before jumping into the sea | ~85% | No one dies for a painting — this act confirms that the box contains someone he values more than his own life |
False Clues
| # | Clue | Location (chapter/percentage) | Misdirection |
|---|---|---|---|
| 1 | Wyatt had been negotiating for weeks before departure with the Italian art dealer Nicolino | ~15% | Leads the reader (together with the narrator) to believe the box is a purchased masterpiece; this is Poe's carefully laid trap of the narrator's rationalized certainty |
| 2 | The box bears the address "Adelaide Curtis, Albany" — Wyatt's mother-in-law | ~22% | The true destination address; but because it appears "suspicious," the narrator becomes even more convinced that it is a cover designed to protect a precious painting from theft |
| 3 | The narrator talks himself out of the weeping sounds — "that sobbing must have been my imagination" | ~66% | Poe lets the reader watch a clue being rationalized away in real time, underscoring the narrator's cognitive blind spot |
Story Two: "The System of Doctor Tarr and Professor Fether"
Mystery One: Who Are the Real Director and Attendants? (whodunit of identity)
- Clue convergence point: ~45%
- Answer: Maillard himself is a lunatic — the former director of the asylum who went insane three years earlier and became a patient. He organized the patients in an uprising, had the real attendants tarred and feathered and locked in the cellars, then impersonated the director to entertain visitors.
Key Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | The "attendants and visitors" at the banquet behave in the most extreme manner: one imitates a frog and croaks; one spins without stopping; one strains to climb onto the table; one clucks like a hen | ~40–50% | These behaviors precisely match the patient symptoms Maillard had just described — he was describing his companions, not his subordinates |
| 2 | Maillard recounts the story of "a certain patient who stirred up the others to overthrow the attendants" with an expression that is far too vivid and detailed | ~55–60% | The density of detail in an eyewitness account versus that of a bystander is entirely different — clue convergence point: Maillard is the protagonist of the story he is telling |
| 3 | "Director" Maillard's so-called "new treatment" is named after "Doctor Tarr and Professor Fether" — names that sound absurdly comic | ~65% | "Tar and Feather" is a byword for American frontier mob justice — the director is describing exactly what he did to the attendants |
| 4 | Noises outside escalate; the "attendants" at the banquet begin to lose control; Maillard hurls a chair in an attempt to block the windows | ~85–90% | The imprisoned real attendants have escaped and are converging on the main building |
Supporting Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | Every door and window in the establishment is covered with heavy iron bolts and iron shutters, sealing it completely from the outside | ~25% | An ordinary asylum would have no need of such military-grade fortification; these barriers were erected by the patients to prevent rescue from outside |
| 2 | Throughout the entire dinner no visitor is able to speak with anyone other than the supposed asylum staff | ~40% | A normal asylum would not isolate visitors so completely; this is because every "staff member" is a patient, and no outside corroboration can be allowed |
| 3 | Maillard's bearing and manner are distinguished, yet there is throughout a quality of "overwrought rationality," as though he is constantly laboring to demonstrate his own sanity | Throughout | A sane person feels no need to prove repeatedly that he is not mad |
False Clues
| # | Clue | Location (chapter/percentage) | Misdirection |
|---|---|---|---|
| 1 | Maillard explains in highly academic language the principles of the "soothing system" and the reasons it was abandoned | ~20–35% | Leads the visitor (and the reader) to accept him as a genuine medical professional rather than a patient |
| 2 | Maillard informs the narrator that the people he sees are staff members, not patients, and that the system of allowing patients to move freely has been abolished | ~30% | An explicit positive declaration directs the reader to stop questioning — Poe uses the authority figure's direct statement to mask the plainly visible abnormalities in front of them |
Story Three: "Maelzel's Chess-Player" (Analytical Non-Fiction)
Mystery One: How Does the Automaton Actually Operate? (howdunit)
- Clue convergence point: ~15% (Poe announces his conclusion almost from the opening)
- Answer: A real human chess-player is concealed inside the machine. Through an ingenious arrangement of interior space, this person shifts hiding positions as Maelzel displays the supposedly empty interior of the cabinet, staying always out of the audience's line of sight.
Key Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | The automaton makes immediate and appropriate adjustments in response to every "unconventional move" by its opponent | ~15% | A purely mechanical device can only follow a fixed program and cannot respond to the infinite variations of a chess game; this capacity is in itself proof of human intelligence |
| 2 | When displaying the "interior" of the machine, Maelzel invariably opens and closes the various doors in a fixed, predetermined sequence, carrying a candle through the interior as he goes | ~40% | The display routine is highly deliberate — precisely designed so that the audience can see only the unoccupied half at any given moment, while the human player has just moved to the other half |
| 3 | When the automaton makes an error during a game, it pauses briefly before reconsidering — a purely mechanical device does not "reconsider" | ~55% | Hesitation and revision in decision-making are hallmarks of human cognition, not mechanical logic |
| 4 | Before each match the machine's cabinet must be "wound up" by Maelzel himself, but the duration and force of the winding vary from one occasion to the next | ~60% | If the device were purely mechanical, winding should follow a precise and fixed procedure; varying degrees of winding more closely resemble a form of communication with the person inside |
Supporting Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | The automaton's chess skill is exceptionally high; historical records show it won virtually every game | Throughout | A mechanical program cannot "play well," because the variations of chess are inexhaustible; a high level of play itself implies human involvement |
| 2 | Poe draws a contrast between the chess-player and Babbage's calculating machine: the calculating machine handles determinate problems, whereas the chess-player confronts indeterminate ones | ~10% | This argument is itself a rigorous proof that the device cannot be purely mechanical |
Story Four: "The Man That Was Used Up"
Mystery One: What Is the Unspeakable "Something" about General Smith? (whatishim)
- Clue convergence point: ~70%
- Answer: In the campaign against the Bugaboo and Kickapoo Indians, General Smith suffered the loss of virtually every part of his body, each replaced by the most advanced prosthetic or artificial organ then available: a cork leg, a mechanical arm, an artificial shoulder, a false chest, a false palate, false teeth, a glass eye, and an artificial palate. Without these components he is nothing at all.
Key Clues
| # | Clue | Location (chapter/percentage) | Notes |
|---|---|---|---|
| 1 | Smith displays an intensity of enthusiasm for "the progress of mechanical invention" wholly out of proportion to normal interest, and the topic always circles back to "mechanical limbs" and "artificial organs" | ~30% | Only a personal, lived stake produces so consuming an obsession; his passion springs from direct personal experience |
| 2 | Every person the narrator asks about "what is particular about Smith" is interrupted before the sentence is finished — this happens more than five times | ~30–70% | Poe uses comic repetition to imply that this "secret" is something everyone knows but that social convention renders unmentionable, while building the reader's curiosity to a peak |
| 3 | The narrator finds a "strange something" writhing on Smith's bedroom floor, gives it a kick, and the thing speaks | ~88% | Clue convergence point — the true state of Smith before he has assembled his equipment is that shapeless, groaning lump on the floor |
| 4 | The Black servant Pompey fits Smith with his leg, arm, shoulder, chest, palate, teeth, eye, and palate in sequence | ~90–95% | Revealed piece by piece: a "perfect" general is assembled from industrial components |
False Clues
| # | Clue | Location (chapter/percentage) | Misdirection |
|---|---|---|---|
| 1 | The narrator repeatedly emphasizes the irreproachable perfection of Smith's exterior — his hair, his whiskers, his teeth, his eyes, his shoulders, the curve of his calves | First half throughout | The reader is directed toward "a mystery of character" or "a secret of war," rather than toward "his body is artificial" |
| 2 | Every person consulted mentions "the Bugaboo and Kickapoo campaign," implying that the answer is connected to the war | Throughout | Relevant, but misdirects toward "heroic wartime deeds" rather than "the war's aftermath — prosthetics" |
Reasoning Path Reconstruction
"The Oblong Box"
This story is a refined specimen of Poe's "overconfident narrator" technique. The puzzle structure unfolds as follows:
First layer (0–20%): The narrator establishes his own credentials as a reasoner — he has seen through what Wyatt is concealing from him (a masterpiece!), and is quietly pleased with his own perspicacity. Here Poe sets the trap: the more self-assured the reasoner, the deeper the blind spot.
Second layer (22–64%): Clues accumulate one after another — the coffin dimensions, the smell of tar, the false wife, the nightly secret ritual — but the narrator's self-assurance succeeds each time in "rationalizing" them away: "Wyatt is simply admiring his painting." By now the reader ought to have pulled well clear of the narrator's perspective.
Third layer (65–66%): The weeping. This is the last clue by which a careful reader could independently solve the puzzle — because no interpretation can account for a man weeping over an oil painting.
Fourth layer (100%): The captain's retrospective explanation makes everything explicit. Poe deliberately places the revelation after the mystery has "vanished" (with the shipwreck), ensuring that even the most astute reader must wait for the author's willingness to tell before the full motive can be known.
The essence: The real mystery of this story is not "what is in the box" but "to what degree can a person love another." Wyatt could not mourn his wife openly in New York; in the end he chose to be buried with her at sea. Poe uses the form of a puzzle to narrate a tragedy that could not otherwise be spoken.
"The System of Doctor Tarr and Professor Fether"
The reasoning path in this story is built upon the accumulation of abnormal behavior:
Node one (~40%): The "attendants and visitors" at the banquet begin to act strangely. The typical reader's first instinct is "perhaps asylums are simply eccentric places." The careful reader should stop here and realize: these behaviors match precisely the patient symptoms Maillard had just described — he was describing his companions, not his subordinates.
Node two (~55–60%): Maillard narrates the story of "a certain patient who stirred the others to overthrow the attendants" — the detail is too specific, too much like the account of someone who was there. The reader should at this point form the hypothesis: Maillard himself is that patient.
Node three (~85%): The noise outside escalates; the banquet descends into chaos — the imprisoned attendants have broken free and are advancing on the house, and the story's final revelation confirms the solution.
Poe's technique lies in this: he lets the bizarre banquet behavior proceed throughout the story with such an air of matter-of-fact normality that the reader, like the narrator, grows accustomed to it — until the shock of reality (the real attendants smashing through the windows) prompts the belated realization that one had been watching the clues all along without seeing them.
"Maelzel's Chess-Player"
This piece is not traditional mystery narrative but Poe's own demonstration of "how to think like Dupin" — an argumentative essay:
Poe's path is entirely reversed: he announces the conclusion first (there is a man inside the machine), then systematically eliminates counter-arguments one by one, and finally supplements his observations to describe how that person operates the mechanism. This is a demonstration of deduction: from the impossibility of purely mechanical intelligence, to the necessary existence of a human agent, to a description of how that agent operates.
The place of this essay in the history of detective fiction: Here, in non-fiction, Poe genuinely exhibits the Dupin methodology. "Eliminate the impossible; whatever remains, however improbable, must be the truth" — this principle is rigorously executed throughout. "Maelzel's Chess-Player" was published five years before the first Dupin story; in it one can see plainly how Poe's analytical thinking evolved from non-fictional rational practice into the fictional figure of the detective.
"The Man That Was Used Up"
This is one of Poe's rare purely comedic puzzles, yet its deductive structure is complete:
Nodes (~30–70%): The repeated pattern of interruption is itself the central clue. When a question is asked repeatedly and people keep beginning to answer only to be cut off, the reader should recognize: the answer is a fact that is inconvenient to state aloud. Smith's fixation on mechanical prosthetics (~30%) is an early clue, though easily mistaken for mere personality quirk.
Resolution (~90%): The final bedroom scene reveals the answer in the mode of absurdist comedy — a bundle of rags speaks, and is then assembled piece by piece into a human being. Poe lets the satirical sting surpass the puzzle itself: a man of the industrial age can be completely "replaced."
Additional Notes
The Central Theme of This Volume: "The Overconfident Observer Is the Worst Witness"
The most important contribution of Volume Four to detective reasoning is Poe's exploration, in multiple forms, of a single proposition — a confident observer is often the worst reasoner:
- The narrator of "The Oblong Box": having fixed on the "painting" hypothesis too early, he subsequently distorts every clue to support a false premise.
- The visitor of "Tarr and Fether": because of the social assumption that "a director is naturally a sane person," he remains blind to the overwhelming abnormalities right in front of him.
- The narrator of "The Man That Was Used Up": so dazzled by the surface "perfection" that he never considers the possibility that "perfection" itself might be artificial.
All three stories point toward a central warning for the art of reasoning: preconceived assumptions are the root of every error in deduction. What allows Dupin to succeed in Volumes One and Two is precisely his ability to suspend all prior assumptions; the narrators of Volume Four are, without exception, imprisoned by theirs.
The Relationship between "Maelzel's Chess-Player" and the Dupin Methodology
"Maelzel's Chess-Player" (1836) was published five years before the first Dupin story, "The Murders in the Rue Morgue" (1841). Tracing from this analytical essay to the appearance of Dupin, one can see clearly how Poe's deductive thinking evolved from non-fictional analytical practice into the image of the fictional detective: the same method of elimination, the same movement from observed detail to the one possible conclusion, the same refusal to stop questioning where others have given up.
If the Dupin trilogy represents the canonical form of Poe's detective literature, "Maelzel's Chess-Player" is the working draft from which that canon was forged.
The Influence of "The System of Doctor Tarr and Professor Fether" on Later Literature
The premise of this story — madmen governing the sane — recurs throughout later crime fiction and psychological thriller. The most direct heir is Flaubert's Madame Bovary (1856) and its satire of collective social delusion; the broader influence extends to every narrative of the form "who, in truth, is the madman?" — from One Flew Over the Cuckoo's Nest (1962) to the vast range of confined-space psychological thrillers.
Poe's most refined stroke in this story is making the reader herself a victim of the deception — we sit at the banquet alongside the narrator, taking the absurdities around us as given. Only at the ending do we realize that we have been dining with lunatics all along.
The Place of This Volume in Poe's Complete Works
Volume Four occupies the most "non-canonical" position in the five-volume Raven Edition: a mixture of farce (the multiple literary satires beyond "Maelzel"), black comedy ("The Man That Was Used Up"), Gothic grotesque ("Metzengerstein"), and analytical essay ("Maelzel's Chess-Player").
Yet it is precisely in this apparently loose and miscellaneous collection that Poe buries his deepest thinking about detective literature: if Volume One (Dupin) is the affirmative declaration that "reason can solve the mystery," Volume Four is the complementary counter-statement that "human cognition is itself the greatest mystery and the greatest obstacle." Only taken together do the two constitute the complete Poe.
← Back to home