After the cabinets we took the chairs. The cushions we probed with
the fine long needles you have seen me employ. From the tables we
removed the tops."

"Why so?"

"Sometimes the top of a table, or other similarly arranged piece of
furniture, is removed by the person wishing to conceal an article;
then the leg is excavated, the article deposited within the cavity,
and the top replaced. The bottoms and tops of bedposts are employed
in the same way."

"But could not the cavity be detected by sounding?" I asked.

"By no means, if, when the article is deposited, a sufficient wadding
of cotton be placed around it. Besides, in our case, we were obliged
to proceed without noise."

"But you could not have removed - you could not have taken to pieces
all articles of furniture in which it would have been possible to
make a deposit in the manner you mention. A letter may be compressed
into a thin spiral roll, not differing much in shape or bulk from a
large knitting-needle, and in this form it might be inserted into the
rung of a chair, for example. You did not take to pieces all the
chairs?"

"Certainly not; but we did better - we examined the rungs of every
chair in the hotel, and, indeed the jointings of every description of
furniture, by the aid of a most powerful microscope. Had there been
any traces of recent disturbance we should not have failed to detect