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Rh he would leave his hotel. Did the composer fear an interruption—and from whom?"

"We are coming now rather into the region of guess work," said Dr. Mortimer. "Say, rather, into the region where we balance probabilities and choose the most likely. It is the scientific use of the imagination, but we have always some material basis on which to start our speculations. Now, you would call it a guess, no doubt, but I am almost certain that this address has been written in an hotel."

"How in the world can you say that?"

"If you examine it carefully you will see that both the pen and the ink have given the writer trouble. The pen has spluttered twice in a single word, and has run dry three times in a short address, showing that there was very little ink in the bottle. Now, a private pen or ink-bottle is seldom allowed to be in such a state, and the combination of the two must be quite rare. But you know the hotel ink and the hotel pen, where it is rare to get anything else. Yes, I have very little hesitation in saying that could we examine the waste-paper baskets of the hotels round Charing Cross until we found the remains of the mutilated Times leader we could lay our hands straight upon the person who sent this singular message. Halloa! Halloa! What's this?"

He was carefully examining the foolscap, upon which the words were pasted, holding it only an inch or two from his eyes.

"Well?"

"Nothing," said he, throwing it down. "It is a blank half-sheet of paper, without even a watermark upon it. I think we have drawn as much as we can from this curious letter; and now, Sir Henry, has anything else of interest happened to you since you have been in London?"

"Why, no, Mr. Holmes. I think not."

"You have not observed anyone follow or watch you?"

"I seem to have walked right into the thick of a dime novel," said our visitor. "Why in thunder should anyone follow or watch me?"

"We are coming to that. You have nothing else to report to us before we go into this matter?"

"Well, it depends upon what you think worth reporting."

"I think anything out of the ordinary routine of life well worth reporting."

Sir Henry smiled.

"I don't know much of British life yet, for I have spent nearly all my time in the States and in Canada. But I hope that to lose one of your boots is not part of the ordinary routine of life over here."

"You have lost one of your boots?"

"My dear sir," cried Dr. Mortimer, "it is only mislaid. You will find it when you return to the hotel. What is the use of troubling Mr. Holmes with trifles of this kind?"

"Well, he asked me for anything outside the ordinary routine."

"Exactly," said Holmes, "however foolish the incident may seem. You have lost one of your boots, you say?"

"Well, mislaid it, anyhow. I put them both outside my door last night, and there was only one in the morning. I could get no sense out of the chap who cleans them. The worst of it is that I only bought the pair