"Could he have got at it afterwards?" asked Jan.

"It is, I say, an impossibility. He never was within a yard or two of the bureau; and, if he had been, the place was firmly locked. That man it certainly was not. Nobody has been in the room since, save myself, and you for a few minutes to-day when I called you in. And yet the paper is gone!"

"Could anybody have come into the room by the other door?" asked Jan.

"No. It opens with a latch-key only, as this does, and the key was safe in my pocket."

"Well, this beats everything," cried Jan. "It's like the codicil at Verner's Pride."

"The very thing it put me in mind of," said Dr. West. "I'd rather—I'd rather have lost that codicil, had it been mine, than lose this, Mr. Jan."

Jan opened his eyes. Jan had a knack of opening his eyes when anything surprised him—tolerably wide, too, "What paper was it, then?" he cried.

"It was a prescription, Mr. Jan."

"A prescription!" returned Jan, the answer not lessening his wonder. "That's not much. Isn't it in the book?"

"No, it is not in the book," said Dr. West. "It was too valuable to be in the book. You may look, Mr. Jan, but I mean what I say. This was a private prescription of inestimable value—a secret prescription, I may say. I would not have lost it for the whole world."