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of one trained to observation and analysis. His conclusions were as infallible as so many propositions of Euclid. So startling would his results appear to the uninitiated that until they learned the processes by which he had arrived at them they might well consider him as a necromancer.

โ€œFrom a drop of water,โ€ said the writer, โ€œa logician could infer the possibility of an Atlantic or a Niagara without having seen or heard of one or the other. So all life is a great chain, the nature of which is known whenever we are shown a single link of it. Like all other arts, the Science of Deduction and Analysis is one which can only be acquired by long and patient study nor is life long enough to allow any mortal to attain the highest possible perfection in it. Before turning to those moral and mental aspects of the matter which present the greatest difficulties, let the enquirer begin by mastering more elementary problems. Let him, on meeting a fellow-mortal, learn at a glance to distinguish the history of the man, and the trade or profession to which he belongs. Puerile as such an exercise may seem, it sharpens the faculties of observation, and teaches one where to look and what to look for. By a manโ€™s finger nails, by his coat-sleeve, by his boot, by his trouser knees, by the callosities of his forefinger and thumb, by his expression, by his shirt cuffsโ โ€”by each of these things a manโ€™s calling is plainly revealed. That all united should fail to enlighten the competent enquirer in any case is almost inconceivable.โ€

โ€œWhat ineffable twaddle!โ€ I cried, slapping the magazine down on the table, โ€œI never read such rubbish in my life.โ€

โ€œWhat is it?โ€ asked Sherlock Holmes.

โ€œWhy, this article,โ€ I said, pointing at it with my egg spoon as I sat down to my breakfast. โ€œI see that you have read it since you have marked it. I donโ€™t deny that it is smartly written. It irritates me though. It is evidently the theory of some armchair lounger who evolves all these neat little paradoxes in the seclusion of his own study. It is not practical. I should like to see him clapped down in a third class carriage on the Underground, and asked to give the trades of all his fellow-travellers. I would lay a thousand to one against him.โ€

โ€œYou would lose your money,โ€ Sherlock Holmes remarked calmly. โ€œAs for the article, I wrote it myself.โ€

โ€œYou!โ€

โ€œYes, I have a turn both for observation and for deduction. The theories which I have expressed there, and which appear to you to be so chimerical are really extremely practicalโ โ€”so practical that I depend upon them for my bread and cheese.โ€

โ€œAnd how?โ€ I asked involuntarily.

โ€œWell, I have a trade of my own. I suppose I am the only one in the world. Iโ€™m a consulting detective, if you can understand what that is. Here in London we have lots of Government detectives and lots of private ones. When these fellows are at fault they come to me, and I manage to put them on the right scent. They lay all the evidence before me, and I am generally able, by the help of my knowledge of the history of crime, to set them straight. There is a strong family resemblance about misdeeds, and if you have all the details of a thousand at your finger ends, it is odd if you canโ€™t unravel the thousand and first. Lestrade is a well-known detective. He got himself into a fog recently over a forgery case, and that was what brought him here.โ€

โ€œAnd these other people?โ€

โ€œThey are mostly sent on by private inquiry agencies. They are all people who are in trouble about something, and want a little enlightening. I listen to their story, they listen to my comments, and then I pocket my fee.โ€

โ€œBut do you mean to say,โ€ I said, โ€œthat without leaving your room you can unravel some knot which other men can make nothing of, although they have seen every detail for themselves?โ€

โ€œQuite so. I have a kind of intuition that way. Now and again a case turns up which is a little more complex. Then I have to bustle about and see things with my own eyes. You see I have a lot of special knowledge which I apply to the problem, and which facilitates matters wonderfully. Those rules of deduction laid down in that article which aroused your scorn, are invaluable to me in practical work. Observation with me is second nature. You appeared to be surprised when I told you, on our first meeting, that you had come from Afghanistan.โ€

โ€œYou were told, no doubt.โ€

โ€œNothing of the sort. I knew you came from Afghanistan. From long habit the train of thoughts ran so swiftly through my mind, that I arrived at the conclusion without being conscious of intermediate steps. There were such steps, however. The train of reasoning ran, โ€˜Here is a gentleman of a medical type, but with the air of a military man. Clearly an army doctor, then. He has just come from the tropics, for his face is dark, and that is not the natural tint of his skin, for his wrists are fair. He has undergone hardship and sickness, as his haggard face says clearly. His left arm has been injured. He holds it in a stiff and unnatural manner. Where in the tropics could an English army doctor have seen much hardship and got his arm wounded? Clearly in Afghanistan.โ€™ The whole train of thought did not occupy a second. I then remarked that you came from Afghanistan, and you were astonished.โ€

โ€œIt is simple enough as you explain it,โ€ I said, smiling. โ€œYou remind me of Edgar Allen Poeโ€™s Dupin. I had no idea that such individuals did exist outside of stories.โ€

Sherlock Holmes rose and lit his pipe. โ€œNo doubt you think that you are complimenting me in comparing me to Dupin,โ€ he observed. โ€œNow, in my opinion, Dupin

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