He rang the bell, a door opened, and we stepped into a paved way and then up into a small living-room, where we were received by a hearty and good-natured German woman of fifty. She threw up her hands with a surprised "ACH GOTT, HERR PROFESSOR!" and exhibited a mighty deference for my new acquaintance. By the sparkle in her eye I judged she was a good deal amused, too. The "Herr Professor" talked to her in German, and I understood enough of it to know that he was bringing very plausible reasons to bear for admitting me. They were successful. So the Herr Professor received my earnest thanks and departed. The old dame got her keys, took me up two or three flights of stairs, unlocked a door, and we stood in the presence of the criminal. Then she went into a jolly and eager description of all
