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 reason