it would be you. What is your opinion of the matter?"
'It was a pretty downright sort of question, and my doctor looked rather taken aback.
'"Well," he said, "as I fancy your motive in inquiring into the question must be mere curiosity, I think I may tell you my opinion with tolerable freedom. So, Mr., Mr. Dyson? if you want to know my theory, it is this: I believe that Dr. Black killed his wife."
'"But the verdict," I answered, "the verdict was given from your own evidence."
'"Quite so; the verdict was given in accordance with the evidence of my colleague and myself, and, under the circumstances, I think the jury acted very sensibly. In fact, I don't see what else they could have done. But I stick to my opinion, mind you, and I say this also. I don't wonder at Black's doing what I firmly believe he did. I think he was justified."
'"Justified! How could that be?" I asked. I was astonished, as you may imagine, at the answer I had got. The doctor wheeled round his chair and looked steadily at me for a moment before he answered.
'"I suppose you are not a man of science yourself? No; then it would be of no use my going into detail. I have always been firmly opposed myself to any partnership between physiology and psychology. I believe that both are bound to suffer. No one recognizes more decidedly than I do the impassable gulf, the fathomless abyss that separates the world of consciousness from the sphere of matter. We know that every change of consciousness is accompanied by a rearrangement of the molecules in the grey matter; and that is all. What the link between them is, or why they occur together, we do not know, and most authorities believe that we never can know. Yet, I will tell you that as I did my work, the knife in my hand, I felt convinced, in spite of all theories, that what lay before me was not the brain of a dead woman—not the brain of a human being at all. Of course I saw the face; but it was quite placid, devoid of all expression. It must have been a beautiful face, no doubt, but I can honestly say that I would not have looked in that face when there was life behind it for a thousand guineas, no, nor for twice that sum."
'"My dear sir," I said, "you surprise me extremely. You say that it was not the brain of a human being. What was it then?"
'"The brain of a devil." He spoke quite coolly, and never moved a muscle. "The brain of a devil," he repeated, "and I have no doubt that Black found some way of putting an end to it. I don't blame him if he did. Whatever Mrs. Black was, she was not fit to stay in this world. Will you have anything more? No? Good-night, good-night."
'It was a queer sort of opinion to get from a man of science, wasn't it? When he was saying that he would not have looked on that face when alive for a thousand guineas, or two thousand guineas, I was thinking of the face I had seen, but I said nothing. I went again to Harlesden, and passed from one shop to another, making small purchases, and trying to find out whether there was anything about the Blacks which was not already common property, but there was very little to hear. One of the tradesmen to whom I spoke said he had known the dead woman well; she used to buy of him such quantities of grocery as were required for their small household, for they never kept a servant, but had a charwoman in occasionally, and she had not seen Mrs. Black for months before she died. According to this man Mrs. Black was "a nice lady," always kind and considerate, and so fond of her husband and he of her, as every one thought. And yet, to put the doctor's opinion on one side, I knew what I had seen. And then after thinking it all over, and putting one thing with another, it seemed to me that the only person likely to give me much assistance would be Black himself, and I made up my mind to find him. Of course he wasn't to be found in Harlesden; he had left, I was told, directly after the funeral. Everything in the house had been sold, and one fine day Black got into the train with a small portmanteau, and went, nobody knew where. It was a chance if he were ever heard of again, and it was by a mere chance that I came across him at last. I was walking one day along Gray's Inn Road, not bound for anywhere in particular, but looking about me, as usual, and holding on to my hat, for it was a gusty day in early March, and the wind was making the treetops in the Inn rock and quiver. I had come up from the Holborn end, and I had almost got to Theobald's Road when I noticed a man walking in front of me, leaning on a stick, and to all appearance very feeble. There was something about his look that made me curious, I don't know why, and I began to walk briskly with the idea of overtaking him, when of a sudden his hat blew off and came bounding along the pavement to my feet. Of course I rescued the hat, and gave it a glance as I went towards its owner. It was a biography in itself; a Piccadilly maker's name in the inside, but I don't think a beggar would have picked it out of the gutter. Then I looked up and saw Dr. Black of Harlesden waiting for me. A queer thing, wasn't it? But, Salisbury, what a change! When I saw Dr. Black come down the steps of his house at Harlesden he was an upright man, walking firmly with well-built limbs; a man, I should say, in the prime of his life. And now before me there crouched this wretched creature, bent and feeble, with shrunken cheeks, and hair that was whitening fast, and limbs that trembled and shook together, and misery in his eyes. He thanked me for bringing him his hat, saying, "I don't think I should ever have got it, I can't run much now. A gusty day, sir, isn't it?" and with this he was turning away, but by little and little I contrived to draw him into the current of conversation, and we walked together eastward. I think the man would have been glad to get rid of me; but I didn't intend to let him go, and he stopped at last in front of a miserable house in a miserable street. It was, I verily believe, one of the most wretched quarters I have ever seen: houses that must have been sordid and hideous enough when new, that had gathered foulness with every year, and now seemed to lean and totter to their fall. "I live up there," said Black, pointing to the tiles, "not in the front—in the back. I am very quiet there. I won't ask you to come in now, but perhaps some other day——" I caught him up at that, and told him I should be only too glad to come and see him. He gave me an odd sort of glance, as if he were wondering what on earth I or anybody else could care about him, and I left him fumbling with his latch-key. I think you will say I did pretty well when I tell you that within a few weeks I had made myself an intimate friend of Black's. I shall never forget the first time I went to his room; I hope I shall never see such abject, squalid misery again. The foul paper, from which all pattern or trace of a pattern had long vanished, subdued and penetrated with the grime of the evil street, was hanging in mouldering pennons from the wall. Only at the end of the room was it possible to stand upright, and the sight of the wretched bed and the odour of corruption that pervaded the place made me turn faint and sick. Here I found him munching a piece of bread; he seemed surprised to find that I had kept my promise, but he gave me his chair and sat on the bed while we talked. I used to go to see him often, and we had long conversations together, but he never mentioned Harlesden or his wife. I fancy that he supposed me ignorant of the matter, or thought that if I had heard of it, I should never connect the respectable Dr. Black of Harlesden with a poor garreteer in the backwoods of London. He was a strange man, and as we sat together smoking, I often wondered whether he were mad or sane, for I think the wildest dreams of Paracelsus and the Rosicrucians would appear plain and sober fact compared with the theories I have heard him earnestly advance in that grimy den of his. I once ventured to hint something of the sort to him. I suggested that something he had said was in flat contradiction to all science and all experience. "No," he answered, "not all experience, for mine counts for something. I am no dealer in unproved theories; what I say I have proved for myself, and at a terrible cost. There is a region of knowledge which you will never know, which wise men seeing from afar off shun like the plague, as well they may, but into that region I have gone. If you knew, if you could even dream of what may be done, of what one or two men have done in this quiet world of ours, your very soul would shudder and faint within you. What you have heard from me has been but the merest husk and outer covering of true science—that science which means death, and that which is more awful than death, to those who gain it. No, when men say that there are strange things in the world, they little know the awe and the terror that dwell always with them and about them." There was a sort of fascination about the man that drew me to him, and I was quite sorry to have to leave London for a month or two; I missed his odd talk. A few days after I came back to town I thought I would look him up, but when I gave the two rings at the bell that used to summon him, there was no answer. I rang and rang again,
