the one principle or set of principles of search, which are based upon
the one set of notions regarding human ingenuity, to which the Prefect,
in the long routine of his duty, has been accustomed? Do you not see he
has taken it for granted that all men proceed to conceal a letter,--not
exactly in a gimlet hole bored in a chair-leg--but, at least, in some
out-of-the-way hole or corner suggested by the same tenor of thought
which would urge a man to secrete a letter in a gimlet-hole bored in
a chair-leg? And do you not see also, that such recherches nooks for
concealment are adapted only for ordinary occasions, and would be
adopted only by ordinary intellects; for, in all cases of concealment,
a disposal of the article concealed--a disposal of it in this recherche
manner,--is, in the very first instance, presumable and presumed; and
thus its discovery depends, not at all upon the acumen, but altogether
upon the mere care, patience, and determination of the seekers; and
where the case is of importance--or, what amounts to the same thing in
the policial eyes, when the reward is of magnitude,--the qualities in
question have never been known to fail. You will now understand what I
meant in suggesting that, had the purloined letter been hidden any where
within the limits of the Prefect's examination--in other words, had the
principle of its concealment been comprehended within the principles of
the Prefect--its discovery would have been a matter altogether beyond
question. This functionary, however, has been thoroughly mystified;
and the remote source of his defeat lies in the supposition that the
Minister is a fool, because he has acquired renown as a poet. All fools
are poets; this the Prefect feels; and he is merely guilty of a non
distributio medii in thence inferring that all poets are fools."

"But is this really the poet?" I asked. "There are two brothers, I know;
and both have attained reputation in letters. The Minister I believe has
written learnedly on the Differential Calculus. He is a mathematician,
and no poet."

"You are mistaken; I know him well; he is both. As poet and
mathematician, he would reason well; as mere mathematician, he could
not have reasoned at all, and thus would have been at the mercy of the
Prefect."

"You surprise me," I said, "by these opinions, which have been
contradicted by the voice of the world. You do not mean to set at naught
the well-digested idea of centuries. The mathematical rea