e number!"

"My dear Watson, clumsy as I have been, you surely do not seriously
imagine that I neglected to get the number? No. 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."