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"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