"
I nodded to show that I followed his reasoning.
"It is very customary for pawnbrokers in England, when they
take a watch, to scratch the numbers of the ticket with a pin-
point upon the inside of the case. It is more handy than a label as
there is no risk of the number being lost or transposed. There are
no less than four such numbers visible to my lens on the inside
of this case. Inference -- that your brother was often at low water.
Secondary inference -- that he had occasional bursts of prosper-
ity, or he could not have redeemed the pledge. Finally, I ask you
to look at the inner plate, which contains the keyhole. Look at
the thousands of scratches all round the hole -- marks where the
key has slipped. What sober man's key could have scored those
grooves? But you will never see a drunkard's watch without
them. He winds it at night, and he leaves these traces of his
unsteady hand. Where is the mystery in all this?"
"It is as clear as daylight," I answered. "I regret the injustice
which I did you. I should have had more faith in your marvellous
faculty. May I ask whether you have any professional inquiry on
foot at present?"
"None. Hence the cocaine. I cannot live without brainwork.
What else is there to live for? Stand at the window here. Was
ever such a dreary, dismal, unprofitable world? See how the
yellow fog swirls down the street and drifts across the dun-
coloured houses.
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