Walker of the Secret Service

Walker kept two dog-eared magazines in a pigeonhole of his desk, with a story marked in each. He kept them, he said, to reduce enthusiasm, as a doctor keeps a drug to reduce a fever. They were handed, with the regularity of a habit, to two types of visitors who annoyed him: those persons who volubly admired the professional detective; and that other class who assured him that the inspired amateur, as, for example, some local prosecutor in a criminal case, could outwit the acutest counselors of darkness.

I include the two stories in their instructive order.