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It was difficult to refuse any of Sherlock Holmes' requests, for

they were always so exceedingly definite, and put forward with

such a quiet air of mastery. I felt, however, that when Whitney

was once confined in the cab my mission was practically

accomplished; and for the rest, I could not wish anything better

than to be associated with my friend in one of those singular

adventures which were the normal condition of his existence. In a

few minutes I had written my note, paid Whitney's bill, led him

out to the cab, and seen him driven through the darkness. In a

very short time a decrepit figure had emerged from the opium den,

and I was walking down the street with Sherlock Holmes. For two

streets he shuffled along with a bent back and an uncertain foot.

Then, glancing quickly round, he straightened himself out and

burst into a hearty fit of laughter.