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 criminal activities, he succeeded in solving many of the important crimes on which both the police and the District Attorney's office had hopelessly fallen down.

Due to my peculiar relations with Vance it happened that not only did I participate in all the cases with which he was connected, but I was also present at most of the informal discussions concerning them which took place between him and the District Attorney; and, being of methodical temperament, I kept a fairly complete record of them. In addition, I noted down (as accurately as memory permitted) Vance's unique psychological methods of determining guilt, as he explained them from time to time. It is fortunate that I performed this gratuitous labor of accumulation and transcription, for now that circumstances have unexpectedly rendered possible my making the cases public, I am able to present them in full detail and with all their various side-lights and succeeding steps—a task that would be impossible were it not for my numerous clippings and adversaria.

Fortunately, too, the first case to draw Vance into its ramifications was that of Alvin Benson's murder. Not only did it prove one of the most famous of New York's causes célèbres, but it gave Vance an excellent opportunity of displaying his rare talents of deductive reasoning, and, by its nature and magnitude, aroused his interest in a branch of activity which heretofore had been alien to his temperamental promptings and habitual predilections.

The case intruded upon Vance's life suddenly and