Sherlock Holmes

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Methods of detection

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Holmesian deduction

 

Holmes's primary intellectual detection method is induction, which Holmes rather inaccurately calls deduction.[25] "From a drop of water", he writes, "a logician could infer the possibility of an Atlantic or a Niagara without having seen or heard of one or the other".[26] Holmes stories often begin with a bravura display of his talent for "deduction". It is of some interest to logicians and those interested in logic to try to analyse just what Holmes is doing when he performs his induction. "Holmesian deduction" appears to consist primarily of drawing inferences based on either straightforward practical principles—which are the result of careful inductive study, such as Holmes's study of different kinds of cigar ashes or inference to the best explanation.[27][28][29] One quote often heard from Holmes is "When you have eliminated the impossible, whatever remains, however improbable, must be the truth".

 

Sherlock Holmes's straightforward practical principles are generally of the form, "If 'p', then 'q'," where 'p' is observed evidence and 'q' is what the evidence indicates. But there are also, as may be observed in the following example, intermediate principles. In "A Scandal in Bohemia" Holmes deduces that Watson had got very wet lately and that he had "a most clumsy and careless servant girl". When Watson, in amazement, asks how Holmes knows this, Holmes answers:

It is simplicity itself ... My eyes tell me that on the inside of your left shoe, just where the firelight strikes it, the leather is scored by six almost parallel cuts. Obviously they have been caused by someone who has very carelessly scraped round the edges of the sole in order to remove crusted mud from it. Hence, you see, my double deduction that you had been out in vile weather, and that you had a particularly malignant boot-slitting specimen of the London slavey.

 

In this case, Holmes employed several connected principles:

If leather on the side of a shoe is scored by several parallel cuts, it was caused by someone who scraped around the edges of the sole in order to remove crusted mud.

If a London doctor's shoes are scraped to remove crusted mud, the person who so scraped them is the doctor's servant girl.

If someone cuts a shoe while scraping it to remove encrusted mud, that person is clumsy and careless.

If someone's shoes had encrusted mud on them, then they are likely to have been worn by him in the rain, when it is likely he became very wet.

 

By applying such principles in an obvious way (using repeated applications of modus ponens), Holmes is able to infer from his observation that "the sides of Watson's shoes are scored by several parallel cuts" that:

 

"Watson's servant girl is clumsy and careless" and "Watson has been very wet lately and has been out in vile weather".

 

Deductive reasoning allows Holmes to impressively reveal a stranger's occupation, such as a Retired Sergeant of Marines in A Study in Scarlet; a former ship's carpenter turned pawnbroker in "The Red-Headed League"; and a billiard-marker and a retired artillery NCO in "The Adventure of the Greek Interpreter". Similarly, by studying inanimate objects, Holmes is able to make astonishingly detailed deductions about their owners, including Watson's pocket-watch in "The Sign of the Four" as well as a hat,[30] a pipe,[31] and a walking stick[32] in other stories.

 

Yet Doyle is careful not to present Holmes as infallible—a central theme in "The Adventure of the Yellow Face".[31] At the end of the tale a sobered Holmes tells Watson, “If it should ever strike you that I am getting a little over-confident in my powers, or giving less pains to a case than it deserves, kindly whisper ‘Norbury’ in my ear, and I shall be infinitely obliged to you”.

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Disguise

 

Holmes displays a strong aptitude for acting and disguise. In several stories, he adopts disguises to gather evidence while 'under cover' so convincing that even Watson fails to penetrate them, such as in "The Adventure of Charles Augustus Milverton", "The Man with the Twisted Lip", "The Adventure of the Empty House" and "A Scandal in Bohemia". In other adventures, Holmes feigns being wounded or ill to give effect to his case, or to incriminate those involved, as in "The Adventure of the Dying Detective".

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Weapons and martial arts                                                                               

Pistols

Holmes and Watson carry pistols with them; in the case of Watson often his old service revolver. Watson describes these weapons as being used on seven occasions.[33]

 

Holmes brandishing a weapon

Cane

Holmes, as a gentleman, often carries a stick or cane. He is described by Watson as an expert at singlestick and twice uses his cane as a weapon.[34]

Sword

In "A Study in Scarlet" Watson describes Holmes as an expert with a sword—although none of the stories have Holmes using a sword.[35] It is mentioned in "Gloria Scott" that Holmes practised fencing.

Riding crop

In several stories, Holmes appears equipped with a riding crop and in "A Case of Identity" comes close to thrashing a swindler with it. Using a "hunting crop", Holmes knocks a pistol from John Clay's hand in "The Red-Headed League". In "The Six Napoleons" it is described as his favourite weapon—he uses it to break open one of the plaster busts.

Fist-fighting

Holmes is described as a formidable bare-knuckle fighter. In The Sign of the Four, Holmes introduces himself to a prize-fighter as:

"The amateur who fought three rounds with you at Alison's rooms on the night of your benefit four years back". McMurdo responds by saying, "Ah, you're one that has wasted your gifts, you have! You might have aimed high, if you had joined the fancy".

Holmes engages in hand-to-hand combat with his adversaries on occasions throughout the stories, inevitably emerging the victor.[36] It is mentioned also in "Gloria Scott" that Holmes trained as a boxer, and in "The Yellow Face" Watson comments that "he was undoubtedly one of the finest boxers of his weight that I have ever seen."

Martial arts

In "The Adventure of the Empty House", Holmes recounts to Watson how he used martial arts to overcome Professor Moriarty and fling his adversary to his death down the Reichenbach Falls. He states, "I have some knowledge, however, of baritsu, or the Japanese system of wrestling, which has more than once been very useful to me". The name "baritsu" appears to be a reference to the real-life martial art of Bartitsu, which combined jujitsu with Holmes' canonical skills of boxing and cane fencing.

Physical Condition

In several stories, Holmes is described or demonstrated as having above average physical strength. As an example, in "The Adventure of the Speckled Band", Dr. Roylott, 6 feet tall and wide as a doorframe, demonstrates his strength by bending a fire poker in half. After the Doctor leaves, Holmes "said laughing. 'I am not quite so bulky, but if he had remained I might have shown him that my grip was not much more feeble than his own.' As he spoke he picked up the steel poker and, with a sudden effort, straightened it out again."

In "The Yellow Face" Watson comments of Holmes, that "Few men were capable of greater muscular effort."

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Knowledge and skills

 

Sherlock Holmes (right) and Dr. Watson, by Sidney Paget.                             

 

In the first story, A Study in Scarlet, something of Holmes's background is given. In early 1881, he is presented as an independent student of chemistry with a variety of very curious side interests, almost all of which turn out to be single-mindedly bent towards making him superior at solving crimes. (When he appears for the first time, he is crowing with delight at having invented a new method for detecting bloodstains; in other stories he indulges in recreational home-chemistry experiments, sometimes filling the rooms with foul-smelling vapours.) An early story, "The Adventure of the Gloria Scott", presents more background on what influenced Holmes to become a detective: a college friend's father richly complimented his deductive skills. Holmes maintains strict adherence to scientific methods and focuses on logic and the powers of observation and deduction.

 

Holmes also makes use of phrenology, which was widely popular in Victorian times but now regarded as pseudo-scientific: In "The Adventure of the Blue Carbuncle", he infers from the large size of a man's hat that the owner is intelligent and intellectually inclined, on the grounds that “a man with so large a brain must have something in it”.

 

In A Study in Scarlet, Holmes claims he does not know that the Earth revolves around the Sun, as such information is irrelevant to his work. Directly after having heard that fact from Watson, he says he will immediately try to forget it. He says he believes that the mind has a finite capacity for information storage, and so learning useless things would merely reduce his ability to learn useful things. Dr. Watson subsequently assesses Holmes's abilities thus:

 

Knowledge of Literature – nil.

 

Knowledge of Philosophy – nil.

 

Knowledge of Astronomy – nil.

 

Knowledge of Politics – Feeble.

 

Knowledge of Botany – Variable. Well up in belladonna, opium and poisons generally. Knows nothing of practical gardening.

 

Knowledge of Geology – Practical, but limited. Tells at a glance different soils from each other. After walks, has shown me splashes upon his trousers, and told me by their colour and consistence in what part of London he had received them.

 

Knowledge of Chemistry – Profound.

 

Knowledge of Anatomy – Accurate, but unsystematic.

 

Knowledge of Sensational Literature – Immense. He appears to know every detail of every horror perpetrated in the century.

 

Plays the violin well.

 

Is an expert singlestick player, boxer and swordsman.

 

Has a good practical knowledge of British law.

 

 

--Sir Arthur Conan Doyle, A Study in Scarlet

 

At the very end of A Study in Scarlet itself, it is shown that Holmes knows Latin and needs no translation of Roman epigrams in the original—though knowledge of the language would be of dubious direct utility for detective work; all university students were required to learn Latin at that time.

 

Later stories also contradict the list. Despite Holmes's supposed ignorance of politics, in "A Scandal in Bohemia" he immediately recognises the true identity of the supposed "Count von Kramm". Regarding nonsensational literature, his speech is replete with references to the Bible, Shakespeare, even Goethe. He is able to quote from a letter of Flaubert to George Sand and in the original French.

 

Moreover, in "The Adventure of the Bruce-Partington Plans" Watson reports that in November 1895 "Holmes lost himself in a monograph which he had undertaken upon the Polyphonic Motets of Lassus"—a most esoteric field, for which Holmes would have had to "clutter his memory" with an enormous amount of information which had absolutely nothing to do with crime-fighting—knowledge so extensive that his monograph was regarded as "the last word" on the subject.[37] The later stories abandon the notion that Holmes did not want to know anything unless it had immediate relevance for his profession; in the second chapter of The Valley of Fear, Holmes instead declares that "all knowledge comes useful to the detective", and near the end of "The Adventure of the Lion's Mane" he describes himself as "an omnivorous reader with a strangely retentive memory for trifles".

 

Holmes is also a competent cryptanalyst. He relates to Watson, "I am fairly familiar with all forms of secret writing, and am myself the author of a trifling monograph upon the subject, in which I analyse one hundred and sixty separate ciphers". One such scheme is solved using frequency analysis in "The Adventure of the Dancing Men".

 

Holmes's analysis of physical evidence is both scientific and precise. His methods include the use of latent prints such as footprints, hoof prints and bicycle tracks to identify actions at a crime scene (A Study in Scarlet, "The Adventure of Silver Blaze", "The Adventure of the Priory School", The Hound of the Baskervilles, "The Boscombe Valley Mystery"), the use of tobacco ashes and cigarette butts to identify criminals ("The Adventure of the Resident Patient", The Hound of the Baskervilles), the comparison of typewritten letters to expose a fraud ("A Case of Identity"), the use of gunpowder residue to expose two murderers ("The Adventure of the Reigate Squire"), bullet comparison from two crime scenes ("The Adventure of the Empty House"), analysis of small pieces of human remains to expose two murders (The Adventure of the Cardboard Box) and even an early use of fingerprints ("The Norwood Builder"). Holmes also demonstrates knowledge of psychology in "A Scandal in Bohemia", luring Irene Adler into betraying where she had hidden a photograph based on the "premise" that an unmarried woman will seek her most valuable possession in case of fire, whereas a married woman will grab her baby instead.

 

Despite the excitement of his life (or perhaps seeking to leave it behind), Holmes retired to the Sussex Downs to take up beekeeping ("The Second Stain") and wrote a book on the subject entitled "Practical Handbook of Bee Culture, with Some Observations upon the Segregation of the Queen".[38] His search for relaxation can also be seen in his love for music, notably in "The Red-Headed League", wherein Holmes takes an evening off from a case to listen to Pablo de Sarasate play violin.[citation needed]

 

He also enjoys vocal music, particularly Wagner ("The Adventure of the Red Circle").

 

The film Young Sherlock Holmes (1985), which speculates about Holmes's youthful adventures, shows Holmes as a brilliant secondary school student, being mentored simultaneously by an eccentric professor/inventor and his dedicated fencing instructor.

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Influence

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Forensic science

 

1852 microscope

 

Sherlock Holmes remains a great inspiration for forensic science, especially for the way his acute study of a crime scene yields small clues as to the precise sequence of events. He makes great use of trace evidence such as shoe and tire impressions, as well as fingerprints, ballistics and handwriting analysis, now known as questioned document examination. Such evidence is used to test theories conceived by the police, for example, or by the investigator himself. All of the techniques advocated by Holmes later became reality, but were generally in their infancy at the time Conan Doyle was writing. In many of his reported cases, Holmes frequently complains of the way the crime scene has been contaminated by others, especially by the police, emphasising the critical importance of maintaining its integrity, a now well-known feature of crime scene examination.

 

Owing to the small scale of the trace evidence (such as tobacco ash, hair or fingerprints), he often uses a magnifying glass at the scene, and an optical microscope back at his lodgings in Baker Street. He uses analytical chemistry for blood residue analysis as well as toxicology examination and determination for poisons. Holmes seems to have maintained a small chemistry laboratory in his lodgings, presumably using simple wet chemical methods for detection of specific toxins, for example. Ballistics is used when spent bullets can be recovered, and their calibre measured and matched with a suspect murder weapon.

 

Holmes was also very perceptive of the dress and attitude of his clients and suspects, noting style and state of wear of their clothes, any contamination (such as clay on boots), their state of mind and physical condition in order to infer their origin and recent history. Skin marks such as tattoos could reveal much about their past history. He applied the same method to personal items such as walking sticks (famously in The Hound of the Baskervilles) or hats (in the case of The Blue Carbuncle), with small details such as medallions, wear and contamination yielding vital indicators of their absent owners.

 

An omission from the stories is the use of forensic photography. Even before Holmes' time, high quality photography was used to record accident scenes, as in the Tay Bridge disaster of 1879, murders in 1888.

 

In 2002, the Royal Society of Chemistry bestowed an honorary fellowship of their organisation upon Sherlock Holmes,[39] for his use of forensic science and analytical chemistry in popular literature, making him the only (as of 2010) fictional character to be thus honoured.

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Role in the history of the detective story

 

Auguste Dupin in "The Purloined Letter"                                          

 

Although Sherlock Holmes is not the original fiction detective (he was influenced by Edgar Allan Poe's C. Auguste Dupin and Émile Gaboriau's Monsieur Lecoq), his name has become a byword for the part. His stories also include several detective story characters such as the loyal but less intelligent assistant, a role for which Dr Watson has become the archetype. The investigating detective became a popular genre with many authors such as Agatha Christie and Dorothy Sayers after the demise of Holmes, with characters such as Hercule Poirot and Lord Peter Wimsey. Forensic methods became less important than the psychology of the criminal, despite the strong growth in forensics in use by the police in the early 20th century.

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Scientific literature

 

Sherlock Holmes has occasionally been used in the scientific literature. John Radford (1999)[40] speculates on his intelligence. Using Conan Doyle’s stories as data, Radford applies three different methods to estimate Sherlock Holmes’s IQ, and concludes that his intelligence was very high indeed, estimated at approximately 190 points. Snyder (2004)[41] examines Holmes’ methods in the light of the science and the criminology of the mid to late 19th century. Kempster (2006)[42] compares neurologists’ skills with those displayed by Holmes. Finally, Didierjean and Gobet (2008)[43] review the literature on the psychology of expertise by taking as model a fictional expert: Sherlock Holmes. They highlight aspects of Doyle’s books that are in line with what is currently known about expertise, aspects that are implausible, and aspects that suggest further research.

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Legacy

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Fan speculation

Main article: Sherlock Holmes speculation

 

The fifty-six short stories and four novels written by Conan Doyle are termed the "canon" by Sherlock Holmes fans. Early scholars of the canon included Ronald Knox[44] in Britain and Christopher Morley in New York,[45] the latter having founded the Baker Street Irregulars, the first society devoted exclusively to the canon of Holmes, in 1934.[46]

 

Writers have produced many pop culture references to Sherlock Holmes, Conan Doyle, or characters from the stories in homage, to a greater or lesser degree. Such allusions can form a plot development, raise the intellectual level of the piece, or act as Easter eggs for an observant audience.[47]

 

Some have been overt, introducing Holmes as a character in a new setting, or a more subtle allusion, such as making a logical character live in an apartment at number 221B. One well-known example of this is the character Gregory House on the show House M.D, whose name and apartment number are both references to Holmes. Often the simplest reference is to dress anybody who does some kind of detective work in a deerstalker and cape.

 

However, throughout the entire novel series, Holmes is never explicitly described as wearing a "deerstalker hat". Holmes dons "his ear-flapped travelling cap" in "The Adventure of Silver Blaze". Sidney Paget first drew Holmes wearing the deerstalker cap and Inverness cape in "The Boscombe Valley Mystery" and subsequently in several other stories.[citation needed]

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"Elementary, my dear Watson"

 

A third major reference is the oft-quoted but non-canonical catchphrase: "Elementary, my dear Watson". This phrase is never actually uttered by Holmes in any of the sixty Holmes stories written by Conan Doyle. In the stories, Holmes often remarks that his logical conclusions are "elementary", in that he considers them to be simple and obvious. He also, on occasion, refers to Dr. Watson as "my dear Watson". The two fragments, however, never appear together. One of the closest examples to this phrase appears in "The Adventure of the Crooked Man", when Holmes explains a deduction:“ "Excellent!" I cried.

 

"Elementary". said he. ”

 

 

The first known use of this phrase was in the 1915 novel, Psmith Journalist, by P. G. Wodehouse. It also appears at the very end of the 1929 film, The Return of Sherlock Holmes, the first Sherlock Holmes sound film. William Gillette, who played Holmes on stage and radio, had previously used the similar phrase, Oh, this is elementary, my dear fellow. The phrase might owe its household familiarity to its use in Edith Meiser's scripts for The New Adventures of Sherlock Holmes radio series, broadcast from 1939 to 1947.

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The Great Hiatus

                                                                          

Holmes and Moriarty fighting over the Reichenbach Falls, by Sidney Paget.

 

Holmes aficionados refer to the period from 1891 to 1894—the time between Holmes's disappearance and presumed death in "The Adventure of the Final Problem" and his reappearance in "The Adventure of the Empty House"—as "the Great Hiatus".[48] It is notable, though, that one later story ("The Adventure of Wisteria Lodge") is described as taking place in 1892.

 

Conan Doyle wrote the first set of stories over the course of a decade. Wanting to devote more time to his historical novels, he killed off Holmes in "The Final Problem," which appeared in print in 1893. After resisting public pressure for eight years, the author wrote The Hound of the Baskervilles, which appeared in 1901, implicitly setting it before Holmes's "death" (some theorise that it actually took place after "The Return" but with Watson planting clues to an earlier date).[49][50] The public, while pleased with the story, was not satisfied with a posthumous Holmes, and so Conan Doyle revived Holmes two years later. Many have speculated on his motives for bringing Holmes back to life, notably writer-director Nicholas Meyer, who wrote an essay on the subject in the 1970s entitled "The Great Man Takes a Walk". The actual reasons are not known, other than the obvious: publishers offered to pay generously. For whatever reason, Conan Doyle continued to write Holmes stories for another 24 years.

 

Some writers have come up with other explanations for the hiatus. In Meyer's novel The Seven-Per-Cent Solution, the hiatus is depicted as a secret sabbatical following Holmes's treatment for cocaine addiction at the hands of Sigmund Freud, and presents Holmes making the light-hearted suggestion that Watson write a fictitious account claiming he had been killed by Moriarty, saying of the public: "They'll never believe you in any case".[citation needed]