"It is cocaine," he said, "a seven-per-cent solution.
Would you care to try it?"
"I have been guilty of several monographs. They are all upon technical subjects.
Here, for example, is one 'Upon the Distinction between the Ashes of the Various Tobaccos'.
In it I enumerate a hundred and forty forms of cigar, cigarette, and pipe tobacco, with coloured plates illustrating the difference in the ash."
"Hence the cocaine.
I cannot live without brain-work.
What else is there to live for?
Stand at the window here. Was ever such a dreary, dismal, unprofitable world?
See how the yellow fog swirls down the street and drifts across the dun-coloured houses.
What could be more hopelessly prosaic and material?
What is the use of having powers, Doctor, when one has no field upon which to exert them?
Crime is commonplace, existence is commonplace, and no qualities save those which are commonplace have any function upon earth.
"His career has been an extraordinary one. He is a man of good birth and excellent education, endowed by nature with a phenomenal mathematical faculty. At the age of twenty-one he wrote a treatise upon the Binomial Theorem, which has had a European vogue. On the strength of it he won the Mathematical Chair at one of our smaller universities, and had, to all appearance, a most brilliant career before him. But the man had hereditary tendencies of the most diabolical kind. A criminal strain ran in his blood, which, instead of being modified, was increased and rendered infinitely more dangerous by his extraordinary mental powers. Dark rumors gathered round him in the university town, and eventually he was compelled to resign his chair and to come down to London, where he set up as an army coach. So much is known to the world, but what I am telling you now is what I have myself discovered.
"As you are aware, Watson, there is no one who knows the higher criminal world of London so well as I do. For years past I have continually been conscious of some power behind the malefactor, some deep organizing power which forever stands in the way of the law, and throws it shield over the wrong-doer. Again and again in cases of the most varying sorts -- forgery cases, robberies, murders -- I have felt the presence of this force, and I have deduced its action in many of those undiscovered crimes in which I have not been personally consulted. For years I have endeavored to break through the veil which shrouded it, and at last the time came when I seized my thread and followed it, until it led me, after a thousand cunning windings, to ex-Professor Moriarty of mathematical celebrity.
"He is the Napoleon of crime, Watson. He is the organizer of half that is evil and of nearly all that is undetected in this great city. He is a genius, a philosopher, an abstract thinker. He has a brain of the first order. He sits motionless, like a spider in the center of its web, but that web has a thousand radiations, and he knows well every quiver of each of them. He does little himself. He only plans. But his agents are numerous and splendidly organized. Is there a crime to be done, a paper to be abstracted, we will say, a house to be rifled, a man to be removed -- the word is passed to the Professor, the matter is organized and carried out. The agent may be caught. In that case money is found for his bail or his defence. But the central power which uses the agent is never caught -- never so much as suspected. This was the organization which I deduced, Watson, and which I devoted my whole energy to exposing and breaking up.
"But the Professor was fenced round with safeguards so cunningly devised that, do what I would, it seemed impossible to get evidence which would convict in a court of law. You know my powers, my dear Watson, and yet at the end of three months I was forced to confess that I had at last met an antagonist who was my intellectual equal. My horror at his crimes was lost in my admiration at his skill. But at last he made a trip -- only a little, little trip -- but it was more than he could afford when I was so close upon him. I had my chance, and, starting from that point, I have woven my net round him until now it is all ready to close. In three days -- that is to say, on Monday next -- matters will be ripe, and the Professor, with all the principal members of his gang, will be in the hands of the police. Then will come the greatest criminal trial of the century, the clearing up of over forty mysteries, and the rope for all of them; but if we move at all prematurely, you understand, they may slip out of our hands even at the last moment.
"Now, if I could have done this without the knowledge of Professor Moriarty, all would have been well. But he was too wily for that. He saw every step which I took to draw my toils round him. Again and again he strove to break away, but I as often headed him off. I tell you, my friend, that if a detailed account of that silent contest could be written, it would take its place as the most brilliant bit of thrust-and-parry work in the history of detection. Never have I risen to such a height, and never have I been so hard pressed by an opponent. He cut deep, and yet I just undercut him. This morning the last steps were taken, and three days only were wanted to complete the business. I was sitting in my room thinking the matter over, when the door opened and Professor Moriarty stood before me.
"My nerves are fairly proof, Watson, but I must confess to a start when I saw the very man who had been so much in my thoughts standing there on my thresh-hold. His appearance was quite familiar to me. He is extremely tall and thin, his forehead domes out in a white curve, and his two eyes are deeply sunken in this head. He is clean-shaven, pale, and ascetic-looking, retaining something of the professor in his features. His shoulders are rounded from much study, and his face protrudes forward, and is forever slowly oscillating from side to side in a curiously reptilian fashion. He peered at me with great curiosity in his puckered eyes.
"'You have less frontal development that I should have expected,' said he, at last. 'It is a dangerous habit to finger loaded firearms in the pocket of one's dressing-gown.'