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 latchkey. 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 made 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, and was just turning to go away, when the door opened and a dirty woman asked me what I wanted. From her look I fancy she took me for a plain-clothes officer after one of her lodgers, but when I inquired if Mr. Black were in, she gave me a stare of another kind. ‘There’s no Mr. Black lives here,’ she said. ‘He’s gone. He’s dead this six weeks.’ I always thought he was a bit queer in his head, or else had been and got into some trouble or other. He used to go out every morning from ten till one, and one Monday morning we heard him come in, and go into his room and shut the door, and a few minutes after, just as we was a-sitting down to our dinner, there was such a scream that I thought I should have gone right off. And then we heard a stamping, and down he came, raging and cursing most dreadful, swearing he had been robbed of something that was worth millions. And then he just dropped down in the passage, and we thought he was dead. We got him up to his room, and put him on his bed, and I just sat there and waited, while my ‘usband he went for the doctor. And there was the winder wide open, and a little tin box he had lying on the floor open and empty, but of course nobody could possible have got in at the winder, and as for him having anything that was worth anything, it’s nonsense, for he was often weeks and weeks behind with his rent, and my ‘usband he threatened often and often to turn him into the street, for, as he said, we’ve got a.living to myke like other people—and, of course, that’s true; but, somehow, I didn’t like to do it, though he was an odd kind of a man, and I fancy had been better off.