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254 followed them in the hopes of marking down their invisible attendant. So wily was he that he had not trusted himself upon foot, but he had availed himself of a cab, so that he could loiter behind or dash past them and so escape their notice. His method had the additional advantage that if they were to take a cab he was all ready to follow them. It has, however, one obvious disadvantage.”

“It puts him in the power of the cab-man.”

“Exactly.”

“What a pity we did not get the number!”

“My dear Watson, clumsy as I have been, you surely do not seriously imagine that I neglected to get the number? 2704 is our man. But that is no use to us for the moment.”

“I fail to see how you could have done more.”

“On observing the cab I should have instantly turned and walked in the other direction. I should then at my leisure have hired a second cab and followed the first at a respectful distance, or, better still, have driven to the Northumberland Hotel and waited there. When our unknown had followed Baskerville home we should have had the opportunity of playing his own game upon himself, and seeing where he made for. As it is, by an indiscreet eagerness, which was taken advantage of with extraordinary quickness and energy by our opponent, we have betrayed ourselves and lost our man.”

We had been sauntering slowly down Regent Street during this conversation, and Dr. Mortimer, with his companion, had long vanished in front of us.

“There is no object in our following them,” said Holmes. “The shadow has departed and will not return. We must see what further cards we have in our hands, and play them with decision. Could you swear to that man’s face within the cab.”

“I could swear only to the beard.”

“And so could I—from which I gather that in all probability it was a false one. A clever man upon so delicate an errand has no use for a beard save to conceal his features. Come in here, Watson!”

He turned into one of the district messenger offices, where he was warmly greeted by the manager.

“Ah, Wilson, I see you have not forgotten the little case in which I had the good fortune to help you?”

“No, sir, indeed I have not. You saved my good name, and perhaps my life.”

“My dear fellow, you exaggerate. I have some recollection, Wilson, that you had among your boys a lad named Cartwright, who showed some ability during the investigation.”

“Yes, sir, he is still with us.”

“Could you ring him up?—thank you! And I should be glad to have change of this five-pound note.”

A lad of fourteen, with a bright, keen face, had obeyed the summons of the manager. He stood now gazing with great reverence at the famous detective.

“Let me have the Hotel Directory,” said Holmes. “Thank you! Now, Cartwright, there are the names of twenty-three hotels here, all in the immediate neighbourhood of Charing Cross. Do you see?”

“Yes, sir.”

“You will visit each of these in turn.”

“Yes, sir.”

“You will begin in each case by giving the outside porter one shilling. Here are twenty-three shillings.”

“Yes, sir.”

“You will tell him that you want to see the waste paper of yesterday. You will say that an important telegram has miscarried and that you are looking for it. You understand?”

“Yes, sir.”

“But what you are really looking for is the centre page of the Times with some holes cut in it with scissors. Here is a copy of the Times. It is this page. You could easily recognise it, could you not?”

“Yes, sir.”

“In each case the outside porter will send for the hall porter, to whom also you will give a shilling. Here are twenty-three shillings. You will then learn in possibly twenty cases out of the twenty-three that the waste of the day before has been burned or removed. In the three other cases you will be shown a heap of paper and you will look for this page of the Times among it. The odds are enormously against your finding it. There are ten shillings over in case of emergencies. Let me have a report by wire at Baker Street before evening. And now, Watson, it only remains for us to find out by wire the identity of the cabman, No. 2704, and then we will drop into one of the Bond Street picture galleries and fill in the time until we are due at the hotel.”