been called upon to do it in the time. The man was obviously innocent, and it is a disgrace to this country that he has never received a penny of compensation for the three years which he spent in jail. A more complex case is that of Oscar Slater, who is still working out his sentence as a convict. I have examined the evidence carefully, including the supplementary evidence given at the very limited and unsatisfactory commission appointed to inquire into the matter, and I have not the faintest doubt that the man is innocent. When the judge asked him at the trial whether he had anything to say why the sentence of death for the murder of Miss Gilchrist should not be pronounced upon him, he cried aloud, “My Lord, I did not know there was such a woman in the world.” I am convinced that this was the literal truth. However, it is proverbially impossible to prove a negative, so there the matter must stand until the people of Scotland insist upon a real investigation into all the circumstances which surround this deplorable case.
A few of the problems which have come my way have been very similar to some which I had invented for the exhibition of the reasoning of Mr. Holmes. I might perhaps quote one in which that gentleman’s method of thought was copied with complete success. The case was as follows. A gentleman had disappeared. He had drawn a bank balance of forty pounds, which was known to be on him. It was feared that he had been murdered for the sake of the money. He had last been heard of stopping at a large hotel in London, having come from the country that day. In the evening he went to a music-hall performance, came out of it about ten o‘clock, returned to his hotel, changed his evening clothes, which were found in his room next day, and disappeared utterly. No one saw him leave the hotel, but a man occupying a neighbouring room declared that he had heard him moving during the night. A week had elapsed at the time that I was consulted, but the police had discovered nothing. Where was the man?
These were the whole of the facts as communicated to me by his relatives in the country. Endeavouring to see the matter through the eyes of Mr. Holmes, I answered by return of post that he was evidently either in Glasgow or in Edinburgh. I proved later that he had as a fact gone to Edinburgh, though in the week that had passed he had moved to another part of Scotland.
There I should leave the matter, for, as Dr. Watson has often shown, a solution explained is a mystery spoiled. However, at this stage the reader can lay down the magazine and show how simple it all is by working out the problem for himself. He has all the data which were ever given to me. For the sake of those, however, who have no turn for such conundrums I will try to indicate the links which make the chain. The one advantage which I possessed was that I was familiar with the routine of London hotels—though, I fancy, it differs little from that of hotels elsewhere.
The first thing was to look at the facts and separate what was certain from what was conjecture. It was all certain except the statement of the person who heard the missing man in the night. How could he tell such a sound from any other sound in a large hotel? That point could be disregarded if it traversedgi the general conclusions. The first clear deduction was that the man had meant to disappear. Why else should he draw all his money? He had got out of the hotel during the night. But there is a night-porter in all hotels, and it is impossible to get out without his knowledge when the door is once shut. The door is shut after the theatre-goers return—say at twelve o‘clock. Therefore the man left the hotel before twelve o’clock. He had come from the music-hall at ten, had changed his clothes, and had departed with his bag. No one had seen him do so. The inference is that he had done it at the moment when the hall was full of the returning guests, which is from eleven to eleven-thirty. After that hour, even if the door were still open, there are few people coming and going; so