“In most cases,” said Carmichael, “it’s only nerves that make people think they’re left-handed. A more extraordinary thing is the matter of parting the hair. Everybody is predestined from birth to part his hair on one particular side; but most of the people who ought to part their hair on the right do it on the left instead, because that’s easier when you’re right-handed.” “I think you’re wrong in principle, Gordon,” said Reeves. “Everybody in the world has his little peculiarities, which would give him away to the eye of a trained detective. You, for example, are the most normal specimen, if I may say so, of the human race. Yet I know which of those whisky glasses on the mantelpiece is yours, though they’re empty.” “Well, which?” asked Gordon, interested. “The one in the middle,” said Reeves. “It’s pushed farther away from the edge: you, like the careful soul you are, instinctively took more precaution against its being brushed off. Aren’t I right?” “To tell the truth, I can’t for the life of me remember. But there, you see, you’re talking of somebody you know. None of us are murderers, at least, I hope not. If you were trying to detect a murderer you’d never been introduced to, you wouldn’t know what to look out for.” “Try it on,” suggested Marryatt. “You know, the Holmes stunt, deducing things from the bowler hat, and from Watson’s brother’s watch. Try that umbrella over there, whatever it’s doing here; what will you deduce from it?” “I should deduce that it had been raining recently,” put in Gordon with great seriousness. “As a matter of fact,” said Reeves, turning the umbrella this way and that, “an umbrella’s a very difficult thing to get any clues out of.” “I’m glad of that,” said Carmichael, “because——” “—only this one,” continued Reeves, ignoring him, “happens to be rather interesting. Anybody could see that it’s pretty new, yet the ferrule at the end of it is nearly worn through, which shows it’s been used a lot. Inference; that it’s used by somebody who doesn’t keep his umbrella for days like this, but uses it as a walking-stick. Therefore it belongs to old Brotherhood; he’s the only man I know in this club who always carries one.” “You see,” said Carmichael, “that’s the sort of thing that happens in real life. As I was just going to say, I brought in that umbrella myself. I took it by mistake from a complete stranger in the Tube.” Mordaunt Reeves laughed a little sourly. “Well,” he said, “the principle holds, anyhow. Everything tells a story, if you are careful not to theorize beyond your data.” “I’m afraid,” said Gordon, “I must be one of Nature’s Watsons. I prefer to leave things where they lie, and let people tell me the story.”