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The Science of deduction

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Chapter 1 - The Science Of Deduction

We met next day as he had arranged, and inspected the rooms at No.

221b, Baker Street, of which he had spoken at our meeting. They

consisted of a couple of comfortable bed-rooms and a single large

airy sitting-room, cheerfully furnished, and illuminated by two broad

windows. So desirable in every way were the apartments, and so

moderate did the terms seem when divided between us, that the bargain

was concluded upon the spot, and we at once entered into possession.

That very evening I moved my things round from the hotel, and on the

following morning Sherlock Holmes followed me with several boxes and

portmanteaus. For a day or two we were busily employed in unpacking

and laying out our property to the best advantage. That done, we

gradually began to settle down and to accommodate ourselves to our

new surroundings.

Holmes was certainly not a difficult man to live with. He was quiet

in his ways, and his habits were regular. It was rare for him to be

up after ten at night, and he had invariably breakfasted and gone out

before I rose in the morning. Sometimes he spent his day at the

chemical laboratory, sometimes in the dissecting-rooms, and

occasionally in long walks, which appeared to take him into the

lowest portions of the City. Nothing could exceed his energy when the

working fit was upon him; but now and again a reaction would seize

him, and for days on end he would lie upon the sofa in the

sitting-room, hardly uttering a word or moving a muscle from morning

to night. On these occasions I have noticed such a dreamy, vacant

expression in his eyes, that I might have suspected him of being

addicted to the use of some narcotic, had not the temperance and

cleanliness of his whole life forbidden such a notion.

As the weeks went by, my interest in him and my curiosity as to his

aims in life, gradually deepened and increased. His very person and

appearance were such as to strike the attention of the most casual

observer. In height he was rather over six feet, and so excessively

lean that he seemed to be considerably taller. His eyes were sharp

and piercing, save during those intervals of torpor to which I have

alluded; and his thin, hawk-like nose gave his whole expression an

air of alertness and decision. His chin, too, had the prominence and

squareness which mark the man of determination. His hands were

invariably blotted with ink and stained with chemicals, yet he was

possessed of extraordinary delicacy of touch, as I frequently had

occasion to observe when I watched him manipulating his fragile

philosophical instruments.

The reader may set me down as a hopeless busybody, when I confess how

much this man stimulated my curiosity, and how often I endeavoured to

break through the reticence which he showed on all that concerned

himself. Before pronouncing judgment, however, be it remembered, how

objectless was my life, and how little there was to engage my

attention. My health forbade me from venturing out unless the weather

was exceptionally genial, and I had no friends who would call upon me

and break the monotony of my daily existence. Under these

circumstances, I eagerly hailed the little mystery which hung around

my companion, and spent much of my time in endeavouring to unravel

it.

He was not studying medicine. He had himself, in reply to a question,

confirmed Stamford's opinion upon that point. Neither did he appear

to have pursued any course of reading which might fit him for a

degree in science or any other recognized portal which would give him

an entrance into the learned world. Yet his zeal for certain studies

was remarkable, and within eccentric limits his knowledge was so

extraordinarily ample and minute that his observations have fairly

astounded me. Surely no man would work so hard or attain such precise

information unless he had some definite end in view. Desultory

readers are seldom remarkable for the exactness of their learning. No

man burdens his mind with small matters unless he has some very good

reason for doing so.

His ignorance was as remarkable as his knowledge. Of contemporary

literature, philosophy and politics he appeared to know next to

nothing. Upon my quoting Thomas Carlyle, he inquired in the naivest

way who he might be and what he had done. My surprise reached a

climax, however, when I found incidentally that he was ignorant of

the Copernican Theory and of the composition of the Solar System.

That any civilized human being in this nineteenth century should not

be aware that the earth travelled round the sun appeared to be to me

such an extraordinary fact that I could hardly realize it.

"You appear to be astonished," he said, smiling at my expression of

surprise. "Now that I do know it I shall do my best to forget it."

"To forget it!"

"You see," he explained, "I consider that a man's brain originally is

like a little empty attic, and you have to stock it with such

furniture as you choose. A fool takes in all the lumber of every sort

that he comes across, so that the knowledge which might be useful to

him gets crowded out, or at best is jumbled up with a lot of other

things so that he has a difficulty in laying his hands upon it. Now

the skilful workman is very careful indeed as to what he takes into

his brain-attic. He will have nothing but the tools which may help

him in doing his work, but of these he has a large assortment, and

all in the most perfect order. It is a mistake to think that that

little room has elastic walls and can distend to any extent. Depend

upon it there comes a time when for every addition of knowledge you

forget something that you knew before. It is of the highest

importance, therefore, not to have useless facts elbowing out the

useful ones."

"But the Solar System!" I protested.

"What the deuce is it to me?" he interrupted impatiently; "you say

that we go round the sun. If we went round the moon it would not make

a pennyworth of difference to me or to my work."

I was on the point of asking him what that work might be, but

something in his manner showed me that the question would be an

unwelcome one. I pondered over our short conversation, however, and

endeavoured to draw my deductions from it. He said that he would

acquire no knowledge which did not bear upon his object. Therefore

all the knowledge which he possessed was such as would be useful to

him. I enumerated in my own mind all the various points upon which he

had shown me that he was exceptionally well-informed. I even took a

pencil and jotted them down. I could not help smiling at the document

when I had completed it. It ran in this way--

Sherlock Holmes--his limits.

1. Knowledge of Literature.--Nil.

2. Philosophy.--Nil.

3. Astronomy.--Nil.

4. Politics.--Feeble.

5. Botany.--Variable. Well up in belladonna, opium, and poisons

generally. Knows nothing of practical gardening.

6. 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.

7. Chemistry.--Profound.

8. Anatomy.--Accurate, but unsystematic.

9. Sensational Literature.--Immense. He appears to know every detail

of every horror perpetrated in the century.

10. Plays the violin well.

11. Is an expert singlestick player, boxer, and swordsman.

12. Has a good practical knowledge of British law.

When I had got so far in my list I threw it into the fire in despair.

"If I can only find what the fellow is driving at by reconciling all

these accomplishments, and discovering a calling which needs them

all," I said to myself, "I may as well give up the attempt at once."

I see that I have alluded above to his powers upon the violin. These

were very remarkable, but as eccentric as all his other

accomplishments. That he could play pieces, and difficult pieces, I

knew well, because at my request he has played me some of

Mendelssohn's Lieder, and other favourites. When left to himself,

however, he would seldom produce any music or attempt any recognized

air. Leaning back in his arm-chair of an evening, he would close his

eyes and scrape carelessly at the fiddle which was thrown across his

knee. Sometimes the chords were sonorous and melancholy. Occasionally

they were fantastic and cheerful. Clearly they reflected the thoughts

which possessed him, but whether the music aided those thoughts, or

whether the playing was simply the result of a whim or fancy was more

than I could determine. I might have rebelled against these

exasperating solos had it not been that he usually terminated them by

playing in quick succession a whole series of my favourite airs as a

slight compensation for the trial upon my patience.

During the first week or so we had no callers, and I had begun to

think that my companion was as friendless a man as I was myself.

Presently, however, I found that he had many acquaintances, and those

in the most different classes of society. There was one little sallow

rat-faced, dark-eyed fellow who was introduced to me as Mr. Lestrade,

and who came three or four times in a single week. One morning a

young girl called, fashionably dressed, and stayed for half an hour

or more. The same afternoon brought a grey-headed, seedy visitor,

looking like a Jew pedlar, who appeared to me to be much excited, and

who was closely followed by a slipshod elderly woman. On another

occasion an old white-haired gentleman had an interview with my

companion; and on another a railway porter in his velveteen uniform.

When any of these nondescript individuals put in an appearance,

Sherlock Holmes used to beg for the use of the sitting-room, and I

would retire to my bed-room. He always apologized to me for putting

me to this inconvenience. "I have to use this room as a place of

business," he said, "and these people are my clients." Again I had an

opportunity of asking him a point blank question, and again my

delicacy prevented me from forcing another man to confide in me. I

imagined at the time that he had some strong reason for not alluding

to it, but he soon dispelled the idea by coming round to the subject

of his own accord.

It was upon the 4th of March, as I have good reason to remember, that

I rose somewhat earlier than usual, and found that Sherlock Holmes

had not yet finished his breakfast. The landlady had become so

accustomed to my late habits that my place had not been laid nor my

coffee prepared. With the unreasonable petulance of mankind I rang

the bell and gave a curt intimation that I was ready. Then I picked

up a magazine from the table and attempted to while away the time

with it, while my companion munched silently at his toast. One of the

articles had a pencil mark at the heading, and I naturally began to

run my eye through it.

Its somewhat ambitious title was "The Book of Life," and it attempted

to show how much an observant man might learn by an accurate and

systematic examination of all that came in his way. It struck me as

being a remarkable mixture of shrewdness and of absurdity. The

reasoning was close and intense, but the deductions appeared to me to

be far-fetched and exaggerated. The writer claimed by a momentary

expression, a twitch of a muscle or a glance of an eye, to fathom a

man's inmost thoughts. Deceit, according to him, was an impossibility

in the case 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.

"From a drop of water," said the writer, "a 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 man'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 cuffs--by each of these things a man's calling is plainly

revealed. That all united should fail to enlighten the competent

enquirer in any case is almost inconceivable."

"What ineffable twaddle!" I cried, slapping the magazine down on the

table, "I never read such rubbish in my life."

"What is it?" asked Sherlock Holmes.

"Why, this article," I said, pointing at it with my egg spoon as I

sat down to my breakfast. "I see that you have read it since you have

marked it. I don't deny that it is smartly written. It irritates me

though. It is evidently the theory of some arm-chair 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."

"You would lose your money," Sherlock Holmes remarked calmly. "As

for the article I wrote it myself."

"You!"

"Yes, 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 practical--so practical that I

depend upon them for my bread and cheese."

"And how?" I asked involuntarily.

"Well, I have a trade of my own. I suppose I am the only one in the

world. I'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 can'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."

"And these other people?"

"They 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."

"But do you mean to say," I said, "that without leaving your room you

can unravel some knot which other men can make nothing of, although

they have seen every detail for themselves?"

"Quite 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."

"You were told, no doubt."

"Nothing 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,

'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.' The whole train of thought

did not occupy a second. I then remarked that you came from

Afghanistan, and you were astonished."

"It is simple enough as you explain it," I said, smiling. "You remind

me of Edgar Allen Poe's Dupin. I had no idea that such individuals

did exist outside of stories."

Sherlock Holmes rose and lit his pipe. "No doubt you think that you

are complimenting me in comparing me to Dupin," he observed. "Now, in

my opinion, Dupin was a very inferior fellow. That trick of his of

breaking in on his friends' thoughts with an apropos remark after a

quarter of an hour's silence is really very showy and superficial. He

had some analytical genius, no doubt; but he was by no means such a

phenomenon as Poe appeared to imagine."

"Have you read Gaboriau's works?" I asked. "Does Lecoq come up to

your idea of a detective?"

Sherlock Holmes sniffed sardonically. "Lecoq was a miserable

bungler," he said, in an angry voice; "he had only one thing to

recommend him, and that was his energy. That book made me positively

ill. The question was how to identify an unknown prisoner. I could

have done it in twenty-four hours. Lecoq took six months or so. It

might be made a text-book for detectives to teach them what to

avoid."

I felt rather indignant at having two characters whom I had admired

treated in this cavalier style. I walked over to the window, and

stood looking out into the busy street. "This fellow may be very

clever," I said to myself, "but he is certainly very conceited."

"There are no crimes and no criminals in these days," he said,

querulously. "What is the use of having brains in our profession? I

know well that I have it in me to make my name famous. No man lives

or has ever lived who has brought the same amount of study and of

natural talent to the detection of crime which I have done. And what

is the result? There is no crime to detect, or, at most, some

bungling villany with a motive so transparent that even a Scotland

Yard official can see through it."

I was still annoyed at his bumptious style of conversation. I thought

it best to change the topic.

"I wonder what that fellow is looking for?" I asked, pointing to a

stalwart, plainly-dressed individual who was walking slowly down the

other side of the street, looking anxiously at the numbers. He had a

large blue envelope in his hand, and was evidently the bearer of a

message.

"You mean the retired sergeant of Marines," said Sherlock Holmes.

"Brag and bounce!" thought I to myself. "He knows that I cannot

verify his guess."

The thought had hardly passed through my mind when the man whom we

were watching caught sight of the number on our door, and ran rapidly

across the roadway. We heard a loud knock, a deep voice below, and

heavy steps ascending the stair.

"For Mr. Sherlock Holmes," he said, stepping into the room and

handing my friend the letter.

Here was an opportunity of taking the conceit out of him. He little

thought of this when he made that random shot. "May I ask, my lad," I

said, in the blandest voice, "what your trade may be?"

"Commissionaire, sir," he said, gruffly. "Uniform away for repairs."

"And you were?" I asked, with a slightly malicious glance at my

companion.

"A sergeant, sir, Royal Marine Light Infantry, sir. No answer? Right,

sir."

He clicked his heels together, raised his hand in a salute, and was

gone.