"I mean to say," continued Dupin, while I merely laughed at his last observations, "that if the minister had been no more than a mathematician, the Prefect would have been under no necessity of giving me this check. I knew him, however, as both mathematician and poet; and my measures were adapted to his capacity, with reference to the circumstances by which he was surrounded. I know him as courtier, too, and as a bold _intrigant_. Such a man, I consider, could not fail to be aware of the ordinary political modes of action. He could not have failed to anticipate--and events have proved that he did not fail to anticipate--the waylayings to which he was subjected. He must have foreseen, I reflected, the secret investigations of his premises. His frequent absences from home at night, which were hailed by the Prefect as certain aids to his success, I regarded only as _ruses_, to afford opportunity for thorough search to the police, and thus the sooner to impress them with the conviction to which G----, in fact, did finally arrive--the conviction that the letter was not upon the premises. I felt, also, that the whole train of thought, which I was at some pains in detailing to you just now, concerning the invariable principle of policial action in searches for articles concealed, I felt that this whole train of thought would necessarily pass through the mind of the minister. It would imperatively lead him to despise all the ordinary _nooks_ of concealment. _He_ could not, I reflected, be so weak as not to see that the most intricate and remote recess of his hôtel would be as open as his commonest closets to the eyes, to the probes, to the gimlets, and to the microscopes of the Prefect. I saw, in fine, that he would be driven, as a matter of course, to _simplicity_, if not deliberately induced to it as a matter of choice. You will remember, perhaps, how desperately the Prefect laughed when I suggested, upon our first interview, that it was just possible this mystery troubled him so much on account of its being so _very_ self-evident." "Yes," said I, "I remember his merriment well. I really thought he would have fallen into convulsions."