light revealed it to the victim. He had trained it, probably by
   the use of the milk which we saw, to return to him when summoned.
   He would put it through this ventilator at the hour that he
   thought best, with the certainty that it would crawl down the
   rope and land on the bed. It might or might not bite the
   occupant, perhaps she might escape every night for a week, but
   sooner or later she must fall a victim.
   "I had come to these conclusions before ever I had entered his
   room. An inspection of his chair showed me that he had been in
   the habit of standing on it, which of course would be necessary
   in order that he should reach the ventilator. The sight of the
   safe, the saucer of milk, and the loop of whipcord were enough to
   finally dispel any doubts which may have remained. The metallic
   clang heard by Miss Stoner was obviously caused by her stepfather
   hastily closing the door of his safe upon its terrible occupant.
   Having once made up my mind, you know the steps which I took in
   order to put the matter to the proof. I heard the creature hiss
   as I have no doubt that you did also, and I instantly lit the
   light and attacked it."
   "With the result of driving it through the ventilator."
   "And also with the result of causing it to turn upon its master
   at the other side. Some of the blows of my cane came home and
   roused its snakish temper, so that it flew upon the first person
   it saw. In this way I am no doubt indirectly responsible for Dr.
   Grimesby Roylott's death, and I cannot say that it is likely to
   weigh very heavily upon my conscience."
   ADVENTURE IX. THE ADVENTURE OF THE ENGINEER'S THUMB
   Of all the problems which have been submitted to my friend, Mr.
   Sherlock Holmes, for solution during the years of our intimacy,
   there were only two which I was the means of introducing to his
   notice--that of Mr. Hatherley's thumb, and that of Colonel
   Warburton's madness. Of these the latter may have afforded a
   finer field for an acute and original observer, but the other was
   so strange in its inception and so dramatic in its details that
   it may be the more worthy of being placed upon record, even if it
   gave my friend fewer openings for those deductive methods of
   reasoning by which he achieved such remarkable results. The story
   has, I believe, been told more than once in the newspapers, but,
   like all such narratives, its effect is much less striking when
   set forth en bloc in a single half-column of print than when the
   facts slowly evolve before your own eyes, and the mystery clears
   gradually away as each new discovery furnishes a step which leads
   on to the complete truth. At the time the circumstances made a
   deep impression upon me, and the lapse of two years has hardly
   served to weaken the effect.
   It was in the summer of '89, not long after my marriage, that the
   events occurred which I am now about to summarize. I had returned
   to civil practice and had finally abandoned Holmes in his Baker
   Street rooms, although I continually visited him and occasionally
   even persuaded him to forgo his Bohemian habits so far as to come
   and visit us. My practice had steadily increased, and as I
   happened to live at no very great distance from Paddington
   Station, I got a few patients from among the officials. One of
   these, whom I had cured of a painful and lingering disease, was
   never weary of advertising my virtues and of endeavoring to send
   me on every sufferer over whom he might have any influence.
   One morning, at a little before seven o'clock, I was awakened by
   the maid tapping at the door to announce that two men had come
   from Paddington and were waiting in the consulting-room. I
   dressed hurriedly, for I knew by experience that railway cases
   were seldom trivial, and hastened downstairs. As I descended, my
   old ally, the guard, came out of the room and closed the door
   tightly behind him.
   "I've got him here," he whispered, jerking his thumb over his
   shoulder; "he's all right."
   "What is it, then?" I asked, for his manner suggested that it was
   some strange creature which he had caged up in my room.
   "It's a new patient," he whispered. "I thought I'd bring him
   round myself; then he couldn't slip away. There he is, all safe
   and sound. I must go now, Doctor; I have my dooties, just the
   same as you." And off he went, this trusty tout, without even
   giving me time to thank him.
   I entered my consulting-room and found a gentleman seated by the
   table. He was quietly dressed in a suit of heather tweed with a
   soft cloth cap which he had laid down upon my books. Round one of
   his hands he had a handkerchief wrapped, which was mottled all
   over with bloodstains. He was young, not more than
   five-and-twenty, I should say, with a strong, masculine face; but
   he was exceedingly pale and gave me the impression of a man who
   was suffering from some strong agitation, which it took all his
   strength of mind to control.
   "I am sorry to knock you up so early, Doctor," said he, "but I
   have had a very serious accident during the night. I came in by
   train this morning, and on inquiring at Paddington as to where I
   might find a doctor, a worthy fellow very kindly escorted me
   here. I gave the maid a card, but I see that she has left it upon
   the side-table."
   I took it up and glanced at it. "Mr. Victor Hatherley, hydraulic
   engineer, 16A. Victoria Street (3d floor)." That was the name,
   style, and abode of my morning visitor. "I regret that I have
   kept you waiting," said I, sitting down in my library-chair. "You
   are fresh from a night journey, I understand, which is in itself
   a monotonous occupation."
   "Oh, my night could not be called monotonous," said he, and
   laughed. He laughed very heartily, with a high, ringing note,
   leaning back in his chair and shaking his sides. All my medical
   instincts rose up against that laugh.
   "Stop it!" I cried; "pull yourself together!" and I poured out
   some water from a caraffe.
   It was useless, however. He was off in one of those hysterical
   outbursts which come upon a strong nature when some great crisis
   is over and gone. Presently he came to himself once more, very
   weary and pale-looking.
   "I have been making a fool of myself," he gasped.
   "Not at all. Drink this." I dashed some brandy into the water,
   and the color began to come back to his bloodless cheeks.
   "That's better!" said he. "And now, Doctor, perhaps you would
   kindly attend to my thumb, or rather to the place where my thumb
   used to be."
   He unwound the handkerchief and held out his hand. It gave even
   my hardened nerves a shudder to look at it. There were four
   protruding fingers and a horrid red, spongy surface where the
   thumb should have been. It had been hacked or torn right out from
   the roots.
   "Good heavens!" I cried, "this is a terrible injury. It must have
   bled considerably."
   "Yes, it did. I fainted when it was done, and I think that I must
   
					     					 			 have been senseless for a long time. When I came to I found that
   it was still bleeding, so I tied one end of my handkerchief very
   tightly round the wrist and braced it up with a twig."
   "Excellent! You should have been a surgeon."
   "It is a question of hydraulics, you see, and came within my own
   province."
   "This has been done," said I, examining the wound, "by a very
   heavy and sharp instrument."
   "A thing like a cleaver," said he.
   "An accident, I presume?"
   "By no means."
   "What! a murderous attack?"
   "Very murderous indeed."
   "You horrify me."
   I sponged the wound, cleaned it, dressed it, and finally covered
   it over with cotton wadding and carbolized bandages. He lay back
   without wincing, though he bit his lip from time to time.
   "How is that?" I asked when I had finished.
   "Capital! Between your brandy and your bandage, I feel a new man.
   I was very weak, but I have had a good deal to go through."
   "Perhaps you had better not speak of the matter. It is evidently
   trying to your nerves."
   "Oh, no, not now. I shall have to tell my tale to the police;
   but, between ourselves, if it were not for the convincing
   evidence of this wound of mine, I should be surprised if they
   believed my statement, for it is a very extraordinary one, and I
   have not much in the way of proof with which to back it up; and,
   even if they believe me, the clews which I can give them are so
   vague that it is a question whether justice will be done."
   "Ha!" cried I, "if it is anything in the nature of a problem
   which you desire to see solved, I should strongly recommend you
   to come to my friend, Mr. Sherlock Holmes, before you go to the
   official police."
   "Oh, I have heard of that fellow," answered my visitor, "and I
   should be very glad if he would take the matter up, though of
   course I must use the official police as well. Would you give me
   an introduction to him?"
   "I'll do better. I'll take you round to him myself."
   "I should be immensely obliged to you."
   "We'll call a cab and go together. We shall just be in time to
   have a little breakfast with him. Do you feel equal to it?"
   "Yes; I shall not feel easy until I have told my story."
   "Then my servant will call a cab, and I shall be with you in an
   instant." I rushed upstairs, explained the matter shortly to my
   wife, and in five minutes was inside a hansom, driving with my
   new acquaintance to Baker Street.
   Sherlock Holmes was, as I expected, lounging about his
   sittingroom in his dressing-gown, reading the agony column of The
   Times and smoking his before-breakfast pipe, which was composed
   of all the plugs and dottles left from his smokes of the day
   before, all carefully dried and collected on the corner of the
   mantelpiece. He received us in his quietly genial fashion,
   ordered fresh rashers and eggs, and joined us in a hearty meal.
   When it was concluded he settled our new acquaintance upon the
   sofa, placed a pillow beneath his head, and laid a glass of
   brandy and water within his reach.
   "It is easy to see that your experience has been no common one,
   Mr. Hatherley," said he. "Pray, lie down there and make yourself
   absolutely at home. Tell us what you can, but stop when you are
   tired and keep up your strength with a little stimulant."
   "Thank you," said my patient. "but I have felt another man since
   the doctor bandaged me, and I think that your breakfast has
   completed the cure. I shall take up as little of your valuable
   time as possible, so I shall start at once upon my peculiar
   experiences."
   Holmes sat in his big armchair with the weary, heavy-lidded
   expression which veiled his keen and eager nature, while I sat
   opposite to him, and we listened in silence to the strange story
   which our visitor detailed to us.
   "You must know," said he, "that I am an orphan and a bachelor,
   residing alone in lodgings in London. By profession I am a
   hydraulic engineer, and I have had considerable experience of my
   work during the seven years that I was apprenticed to Venner &
   Matheson, the well-known firm, of Greenwich. Two years ago,
   having served my time, and having also come into a fair sum of
   money through my poor father's death, I determined to start in
   business for myself and took professional chambers in Victoria
   Street.
   "I suppose that everyone finds his first independent start in
   business a dreary experience. To me it has been exceptionally so.
   During two years I have had three consultations and one small
   job, and that is absolutely all that my profession has brought
   me. My gross takings amount to 27 pounds 10s. Every day, from
   nine in the morning until four in the afternoon, I waited in my
   little den, until at last my heart began to sink, and I came to
   believe that I should never have any practice at all.
   "Yesterday, however, just as I was thinking of leaving the
   office, my clerk entered to say there was a gentleman waiting who
   wished to see me upon business. He brought up a card, too, with
   the name of 'Colonel Lysander Stark' engraved upon it. Close at
   his heels came the colonel himself, a man rather over the middle
   size, but of an exceeding thinness. I do not think that I have
   ever seen so thin a man. His whole face sharpened away into nose
   and chin, and the skin of his cheeks was drawn quite tense over
   his outstanding bones. Yet this emaciation seemed to be his
   natural habit, and due to no disease, for his eye was bright, his
   step brisk, and his bearing assured. He was plainly but neatly
   dressed, and his age, I should judge, would be nearer forty than
   thirty.
   "'Mr. Hatherley?' said he, with something of a German accent.
   'You have been recommended to me, Mr. Hatherley, as being a man
   who is not only proficient in his profession but is also discreet
   and capable of preserving a secret.'
   "I bowed, feeling as flattered as any young man would at such an
   address. 'May I ask who it was who gave me so good a character?'
   "'Well, perhaps it is better that I should not tell you that just
   at this moment. I have it from the same source that you are both
   an orphan and a bachelor and are residing alone in London.'
   "'That is quite correct,' I answered; 'but you will excuse me if
   I say that I cannot see how all this bears upon my professional
   qualifications. I understand that it was on a professional matter
   that you wished to speak to me?'
   "'Undoubtedly so. But you will find that all I say is really to
   the point. I have a professional commission for you, but absolute
   secrecy is quite essential--absolute secrecy, you understand, and
   of course we may expect that more from a man who is alone than
   from one who lives in the bosom of his family.'
   "'If I promise to keep a secret,' said I, 'you may absolutely
   depend upon my doing so.'
   "He looked very hard at me as I spoke, and it seemed to me that I
   had never seen so suspicious and  
					     					 			questioning an eye.
   "'Do you promise, then?' said he at last.
   "'Yes, I promise.'
   "'Absolute and complete silence before, during, and after? No
   reference to the matter at all, either in word or writing?'
   "'I have already given you my word.'
   "'Very good.' He suddenly sprang up, and darting like lightning
   across the room he flung open the door. The passage outside was
   empty.
   "'That's all right,' said he, coming back. 'I know the clerks are
   sometimes curious as to their master's affairs. Now we can talk
   in safety.' He drew up his chair very close to mine and began to
   stare at me again with the same questioning and thoughtful look.
   "A feeling of repulsion, and of something akin to fear had begun
   to rise within me at the strange antics of this fleshless man.
   Even my dread of losing a client could not restrain me from
   showing my impatience.
   "'I beg that you will state your business, sir,' said I; 'my time
   is of value.' Heaven forgive me for that last sentence, but the
   words came to my lips.
   "'How would fifty guineas for a night's work suit you?' he asked.
   "'Most admirably.'
   "'I say a night's work, but an hour's would be nearer the mark. I
   simply want your opinion about a hydraulic stamping machine which
   has got out of gear. If you show us what is wrong we shall soon
   set it right ourselves. What do you think of such a commission as
   that?'
   "'The work appears to be light and the pay munificent.'
   "'Precisely so. We shall want you to come to-night by the last
   train.'
   "'Where to?'
   "'To Eyford, in Berkshire. It is a little place near the borders
   of Oxfordshire, and within seven miles of Reading. There is a
   train from Paddington which would bring you there at about
   11:15.'
   "'Very good.'
   "'I shall come down in a carriage to meet you.'
   "'There is a drive, then?'
   "'Yes, our little place is quite out in the country. It is a good
   seven miles from Eyford Station.'
   "'Then we can hardly get there before midnight. I suppose there
   would be no chance of a train back. I should be compelled to stop
   the night.'
   "'Yes, we could easily give you a shake-down.'
   "'That is very awkward. Could I not come at some more convenient
   hour?'
   "'We have judged it best that you should come late. It is to
   recompense you for any inconvenience that we are paying to you, a
   young and unknown man, a fee which would buy an opinion from the
   very heads of your profession. Still, of course, if you would
   like to draw out of the business, there is plenty of time to do
   so.'
   "I thought of the fifty guineas, and of how very useful they
   would be to me. 'Not at all,' said I, 'I shall be very happy to
   accommodate myself to your wishes. I should like, however, to
   understand a little more clearly what it is that you wish me to
   do.'
   "'Quite so. It is very natural that the pledge of secrecy which
   we have exacted from you should have aroused your curiosity. I
   have no wish to commit you to anything without your having it all
   laid before you. I suppose that we are absolutely safe from
   eavesdroppers?'
   "'Entirely.'
   "'Then the matter stands thus. You are probably aware that
   fuller's-earth is a valuable product, and that it is only found
   in one or two places in England?'
   "'I have heard so.'
   "'Some little time ago I bought a small place--a very small
   place--within ten miles of Reading. I was fortunate enough to
   discover that there was a deposit of fuller's-earth in one of my
   fields. On examining it, however, I found that this deposit was a
   comparatively small one, and that it formed a link between two
   very much larger ones upon the right and left--both of them,
   however, in the grounds of my neighbors. These good people were