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Of course Curtis and I thought he was at the old game; that it was a bit of that sort of extra caution that won't let well alone. So, as I was coming over, I thought I'd just look into the affair as I told you; and, to my astonishment, I found everything perfectly regular; the will properly proved, the death certificate made out correctly and a second certificate signed by two doctors."

      "Did you go into the question of identity?" asked Thorndyke.

      "Oh, yes. I called on one of the doctors, a man named Batson, and ascertained that it was all correct. Batson's eyesight seemed to be none of the best, but he made it quite clear to me that his late patient was certainly our friend Isaac, or Maddock. So that's the end of the case. And if you want to go into it any further you've got to deal with a little pile of bone ash, for our friend is not only dead; he's cremated. That's enough for us. We don't follow our clients to the next world. We are not so thorough as you seem to be."

      "You are flattering me unduly," said Thorndyke. "I'm not so thorough as that; but our clients, when they betake themselves to the happy hunting-ground, usually leave a few of their friends behind to continue their activities. Do you happen to know what Maddock's original occupation was? Had he any profession?"

      "He was originally an engraver, and a very skilful engraver, too, I understand. That was what made him so handy in working the flash note racket. Then he went on the stage for a time, and didn't do badly at that; but I fancy he was more clever at making-up and mimicry than at acting in the dramatic sense. For the last ten years or so he was practising as a painter—chiefly of landscape, though he could do a figure subject or a portrait at a pinch. I don't fancy he sold much, or made any great efforts to sell his work. He liked painting and the art covered his real industries, for he used to tour about in search of subjects and so open up fresh ground for the little operations that actually produced his income."

      "Was his work of any considerable merit?" Thorndyke asked.

      "Well, in a way, yes. It was rather in the American taste, though Maddock was really an Englishman. Our taste, as you know, runs to technical smartness and novelty of handling; and Maddock's work was very peculiar and remarkably smart and slick in handling. He used the knife more than the brush, and he used it uncommonly cleverly. In fact, he was unusually skilful in many ways; and that's the really surprising thing about him, when one considers his extraordinary-looking paws."

      "What was there peculiar about his hands?" asked Thorndyke. "Were they noticeably clumsy in appearance?"

      "Clumsy!" exclaimed O'Donnell. "They were more than that. They were positively deformed. A monkey's hands would be delicate compared with Maddock's, They were short and thick like the paws of an animal. There's some jaw-twisting name for the deformity that he suffered from; bronchodaotilious, or something like that."

      "Brachydactylous." suggested Thorndyke.

      "That's the word; and I daresay you know the sort of paw I mean. It didn't look a very likely hand for a first-class penman and engraver of flash notes, but you can't always judge by appearances. And now as to your other questions: You ask what Maddock was like in appearance. I can only give you the description which I gave to Batson and which he recognized at once."

      "Had he noticed the peculiarity of the hands?" enquired Thorndyke.

      "Yes. I asked him about it and he remembered having observed it when he was attending Maddock. Well, then, our friend was about five feet nine in height, fairly broad and decidedly strong, of a medium complexion with grey eyes and darkish brown hair. That's all I can tell you about him."

      "You haven't got his finger-prints, I suppose?"

      "No. He was never in prison, so we had no chance of getting them."

      "Was he married?"

      "He had been; but some years ago his wife divorced him, or he divorced her. Latterly he has lived as a bachelor."

      "There is nothing else that you can think of as throwing light on his personality or explaining his actions?"

      "Nothing at all, doctor. I've told you all I know about him, and I only hope the information may be more useful than it looks to me."

      "Thank you," said Thorndyke;" your information is not only useful; I expect to find it quite valuable. Reasoning, you know, Mr. O'Donnell," he continued, "is somewhat like building an arch. On a supporting mould, the builder lays a number of shaped stones, or voussoirs; but until all the voussoirs are there, it is a mere collection of stones, incapable of bearing its own weight. Then you drop the last voussoir—the keystone—into its place, and the arch is complete; and now you may take away the supports, for it will not only bear its own weight, but carry a heavy superstructure."

      "That's so, doctor," said O'Donnell. "But, if I may ask, is this all gratuitous wisdom or has any particular bearing?"

      "It has this bearing," replied Thorndyke. "I have myself been, for some time past, engaged, metaphorically, in the building of an arch. When you came here to-night, it was but a collection of shaped and adjusted stones, supported from without. With your kind aid, I have just dropped the keystone into its place. That is what I mean."

      The American thoughtfully arranged the papers in his case, casting an occasional speculative glance at Thorndyke. "I'd like to know," he said presently, "what it was that I told you. It doesn't seem to me that I have produced any startling novelties. However, I know it's no use trying to squeeze you, so I'll get back to my hotel and have a chew at what you've told me."

      He shook hands with us all round, and, when Thorndyke had let him out, we heard him bustling downstairs and away up King's Bench Walk towards Mitre Court.

      For a minute or more after his departure none of us spoke. Thorndyke was apparently ruminating on his newly-acquired information, and Jervis and I on the statement that had so naturally aroused the detective's curiosity.

      At length Jervis opened the inevitable debate. "I begin to see a glimmer of daylight through the case of Septimus Maddock, deceased," said he; "but it is only a glimmer. Whereas, from what you said to O'Donnell, I gather that you have the case quite complete."

      "Hardly that, Jervis," was the reply. "I spoke metaphorically, and metaphors are sometimes misleading. Perhaps I overstated the case; so we will drop metaphor and state the position literally in terms of good, plain, schoolboy logic. It is this: we had certain facts presented to us in connection with Maddock's death. For instance, we observed that the cause of death was obscure, that the body was utterly destroyed by cremation and that Jardine, who was an unofficial witness to some of the formalities, was subsequently pursued by some unknown person with the unmistakable purpose of murdering him. Those were some of the observed facts; and the explanation of those facts was the problem submitted to us; that is to say, we had to connect those facts and supply others by deduction and research, so that they should form a coherent and intelligible sequence, of which the motive for murdering Jardine should form a part.

      "Having observed and examined our facts, we next propose a hypothesis which shall explain them. In this case it would naturally take the form of a hypothetical reconstruction of the circumstances of Maddock's death. That hypothesis must, of course, be in complete agreement with all the facts known to us, including the attempts to murder Jardine. Then, having invented a hypothesis which fits our facts completely, the next stage is to verify it. If the circumstances of Maddock's death were such as we have assumed, certain antecedent events must have occurred and certain conditions must have existed. We make the necessary inquiries and investigations, and we find that those events had actually occurred and those conditions had actually existed. Then it is probable that our hypothesis is correct, particularly if our researches have brought to light nothing that disagrees with it.

      "With our new facts we can probably amplify our hypothesis; reconstruct it in greater detail; and then we have to test and verify it afresh in its amplified and detailed form. And if such new tests still yield an affirmative result, the confirmation of the hypothesis becomes overwhelmingly strong. It is, however, still only hypothesis. But perhaps we light on some final test which is capable of yielding a definite answer, yes or no. If we apply that test—the 'Crucial Experiment,' of the logicians—and obtain an affirmative result, our inquiry is

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