We also measured the thickness of every
book-_cover_, with the most accurate admeasurement, and applied to
each the most jealous scrutiny of the microscope. Had any of the
bindings been recently meddled with, it would have been utterly
impossible that the fact should have escaped observation. Some five or
six volumes, just from the hands of the binder, we carefully probed,
longitudinally, with the needles."
"You explored the floors beneath the carpets?"
"Beyond doubt. We removed every carpet, and examined the boards with
the microscope."
"And the paper on the walls?"
"Yes."
"You looked into the cellars?"
"We did."
"Then," I said, "you have been making a miscalculation, and the letter
is _not_ upon the premises, as you suppose."
"I fear you are right there," said the Prefect. "And now, Dupin, what
would you advise me to do?"
"To make a thorough re-search of the premises."
"That is absolutely needless," replied G----. "I am not more sure that
I breathe than I am that the letter is not at the Hotel."
"I have no better advice to give you," said Dupin.
"You have, of course, an accurate description of the letter?"
"Oh, yes!"--And here the Prefect, producing a memorandum-book,
proceeded to read aloud a minute account of the internal, and
especially of the external appearance of the missing document.
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