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 duplicates. Not only are all the little imperfections on the form—due to defective inking—reproduced faithfully on the window-pane, but the relative positions of the four fingers on both cases agree to the hundredth of an inch. Of course the thumb stamp was made by taking an oval out of the rolled impression on the form."

"Then do you suggest that this murder was committed by someone connected with the Finger-print Department at Scotland Yard?"

"Hardly. But someone has had access to the forms. There has been leakage somewhere."

When we arrived at the little detached house in which the murdered man had lived, the door was opened by an elderly woman, and our friend, Superintendent Miller, greeted us in the hall.

"We are all ready for you, doctor," said he. "Of course, the things have all been gone over once, but we are turning them out more thoroughly now." He led the way into the small, barely-furnished office in which the tragedy had occurred. A dark stain on the carpet and a square hole in one of the window-panes furnished memorials of the crime, which were supplemented by an odd assortment of objects laid out on the newspaper-covered table. These included silver teaspoons, watches, various articles of jewellery, from which the stones had been removed—none