You know as well as I do, how far I have made this assertion good in practice. The two accidents which betrayed me, I could not by any possibility have foreseen. The first was the chance recognition of Levy by the girl in the Battersea Park Road, which suggested a connection between the two problems. The second was that Thipps should have arranged to go down to Denver on the Tuesday morning, thus enabling your mother to get word of the matter through to you before the body was removed by the police and to suggest a motive for the murder out of what she knew of my previous personal history. If I had been able to destroy these two accidentally forged links of circumstance, I will venture to say that you would never have so much as suspected me, still less obtained sufficient evidence to convict.
Of all human emotions, except perhaps those of hunger and fear, the sexual appetite produces the most violent and, under some circumstances, the most persistent reactions; I think, however, I am right in saying that at the time when I wrote my book, my original sensual impulse to kill Sir Reuben Levy had already become profoundly modified by my habits of thought. To the animal lust to slay and the primitive human desire for revenge, there was added the rational intention of substantiating my own theories for the satisfaction of myself and the world. If all had turned out as I had planned, I should have deposited a sealed account of my experiment with the Bank of England, instructing my executors to publish it after my death. Now that accident has spoiled the completeness of my demonstration, I entrust the account to you, whom it cannot fail to interest, with the request that you will make it known among scientific men, in justice to my professional reputation.
The really essential factors of success in any undertaking are money and opportunity, and as a rule, the man who can make the first can make the second. During my early career, though I was fairly well-off, I had not absolute command of circumstance. Accordingly I devoted myself to my profession, and contented myself with keeping up a friendly connection with Reuben Levy and his family. This enabled me to remain in touch with his fortunes and interests, so that, when the moment for action should arrive, I might know what weapons to use.
Meanwhile, I carefully studied criminology in fiction and fact — my work on «Criminal Lunacy» was a side-product of this activity — and saw how, in every murder, the real crux of the problem was the disposal of the body. As a doctor, the means of death were always ready to my hand, and I was not likely to make any error in that connection. Nor was I likely to betray myself on account of any illusory sense of wrongdoing. The sole difficulty would be that of destroying all connection between my personality and that of the corpse. You will remember that Michael Finsbury, in Stevenson's entertaining romance, observes: «What hangs people is the unfortunate circumstance of guilt.» It became clear to me that the mere leaving about of a superfluous corpse could convict nobody, provided that nobody was guilty in connection with that particular corpse. Thus the idea of substituting the one body for the other was early arrived at, though it was not till I obtained the practical direction of St. Luke's Hospital that I found myself perfectly unfettered in the choice and handling of dead bodies. From this period on, I kept a careful watch on all the material brought in for dissection.
My opportunity did not present itself until the week before Sir Reuben's disappearance, when the medical officer at the Chelsea workhouse sent word to me that an unknown vagrant had been injured that morning by the fall of a piece of scaffolding, and was exhibiting some very interesting nervous and cerebral reactions. I went round and saw the case, and was immediately struck by the man's strong superficial resemblance to Sir Reuben. He had been heavily struck on the back of the neck, dislocating the fourth and fifth cervical vertebr? and heavily bruising the spinal cord. It seemed highly unlikely that he could ever recover, either mentally or physically, and in any case there appeared to me to be no object in indefinitely prolonging so unprofitable an existence. He had obviously been able to support life until recently, as he was fairly well nourished, but the state of his feet and clothing showed that he was unemployed, and under present conditions he was likely to remain so. I decided that he would suit my purpose very well, and immediately put in train certain transactions in the City which I had already sketched out in my own mind. In the meantime, the reactions mentioned by the workhouse doctor were interesting, and I made careful studies of them, and arranged for the delivery of the body to the hospital when I should have completed my preparations.
On the Thursday and Friday of that week I made private arrangements with various brokers to buy the stock of certain Peruvian oil-fields, which had gone down almost to waste-paper. This part of my experiment did not cost me very much, but I contrived to arouse considerable curiosity, and even a mild excitement. At this point I was of course careful not to let my name appear. The incidence of Saturday and Sunday gave me some anxiety lest my man should after all die before I was ready for him, but by the use of saline injections I contrived to keep him alive and, late on Sunday night, he even manifested disquieting symptoms of at any rate a partial recovery.
On Monday morning the market in Peruvians opened briskly. Rumours had evidently got about that somebody knew something, and this day I was not the only buyer in the market. I bought a couple of hundred more shares in my own name, and left the matter to take care of itself. At lunch time I made my arrangements to run into Levy accidentally at the corner of the Mansion House. He expressed (as I expected) his surprise at seeing me in that part of London. I simulated some embarrassment and suggested that we should lunch together. I dragged him to a place a bit off the usual beat, and there ordered a good wine and drank of it as much as he might suppose sufficient to induce a confidential mood. I asked him how things were going on 'Change. He said, «Oh, all right,» but appeared a little doubtful, and asked me whether I did anything in that way. I said I had a little flutter occasionally, and that, as a matter of fact, I'd been put on to rather a good thing. I glanced round apprehensively at this point, and shifted my chair nearer to his.
«I suppose you don't know anything about Peruvian Oil, do you?» he said.
I started and looked round again, and leaning across to him, said, dropping my voice:
«Well, I do, as a matter of fact, but I don't want it to get about. I stand to make a good bit on it.»