"Did any see it after?"

"I have not heard of any."

"Thank you. Good morning."

Holmes returned to his seat with that quiet look of inward
satisfaction which meant that he had a congenial task before him.

"Going out, Watson?"

"Unless I can help you."

"No, my dear fellow, it is at the hour of action that I turn to
you for aid. But this is splendid, really unique from some points
of view. When you pass Bradley's, would you ask him to send up a
pound of the strongest shag tobacco? Thank you. It would be as
well if you could make it convenient not to return before
evening. Then I should be very glad to compare impressions as to
this most interesting problem which has been submitted to us this
morning."

I knew that seclusion and solitude were very necessary for my
friend in those hours of intense mental concentration during
which he weighed every particle of evidence, constructed
alternative theories, balanced one against the other, and made up
his mind as to which points were essential and which immaterial.
I therefore spent the day at my club and did not return to Baker
Street until evening. It was nearly nine o'clock when I found
myself in the sitting-room once more.

My first impression as I opened the door was that a fire had
broken out, for the room was so filled with smoke that the light
of the lamp upon the table was blurred by it. As I entered,
however, my fears were set at rest, for it was the acrid fumes of
strong coarse tobacco which took me by the throat and set me
coughing. Through the haze I had a vague vision of Holmes in his
dressing-gown coiled up in an armchair with his black clay pipe
between his lips. Several rolls of paper lay around him.

"Caught cold, Watson?" said he.

"No, it's this poisonous atmosphere."

"I suppose it is pretty thick, now that you mention it."

"Thick! It is intolerable."

"Open the window, then! You have been at your club all day, I
perceive."

"My dear Holmes!"

"Am I right?"

"Certainly, but how?"

He laughed at my bewildered expression.

"There is a delightful freshness about you, Watson, which makes
it a pleasure to exercise any small powers which I possess at
your expense. A gentleman goes forth on a showery and miry day.
He returns immaculate in the evening with the gloss still on his
hat and his boots. He has been a fixture therefore all day. He is
not a man with intimate friends. Where, then, could he have been?
Is it not obvious?"