So he would. And that very fact helps
us, because it narrows the field of inquiry. We know the sort of man to
look for. Because, being certain (as I am) that the man was in the room, I
_know_ that he left in the way I am telling you. He must have left in some
way, and, all the other ways being impossible, this alone remains,
difficult as the feat may seem. The fact of his shutting the window behind
him further proves his coolness and address at so great a height from the
ground."
All this was very plain, but the main point was still dark.
"You say you _know_ that another man was in the room," I said; "how do you
know that?"
"As I said, by an obvious inference. Come, now, you shall guess how I
arrived at that inference. You often speak of your interest in my work,
and the attention with which you follow it. This shall be a simple
exercise for you. You saw everything in the room as plainly as I myself.
Bring the scene back to your memory, and think over the various small
objects littering about, and how they would affect the case. Quick
observation is the first essential for my work.
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