“The facts of the case, as far as I have worked them out, are these: this Joseph Harrison entered the office through the Charles Street door, and knowing his way he walked straight into your room the instant after you left it. Finding no one there he promptly rang the bell, and at the instant that he did so his eyes caught the paper upon the table. A glance showed him that chance had put in his way a State document of immense value, and in an instant he had thrust it into his pocket and was gone. A few minutes elapsed, as you remember, before the sleepy commissionnaire drew your attention to the bell, and those were just enough to give the thief time to make his escape.