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 it after I came home this morning. You see," he explained, "it is quite unmistakable. The rule is that the blood corpuscles of mammals are circular; the one exception is the camel family, in which the corpuscles are elliptical."

"Why," exclaimed Miller, "that seems to connect Woodthorpe with this Camberwell job."

"It connects him with it very conclusively," said Thorndyke. "You are forgetting the finger-prints."

The detective looked puzzled. "What about them?" he asked.

"They were made with stamps—two stamps, as a matter of fact—and those stamps were made by photographic process from the official finger-print form. I can prove that beyond all doubt."

"Well, suppose they were. What then?"

Thorndyke opened a drawer and took out a photograph, which he handed to Miller. "Here," he said, "is the photograph of the official finger-print form which you were kind enough to bring me. What does it say at the bottom there?" and he pointed with his finger.

The superintendent read aloud: "Impressions taken by Joseph Woodthorpe. Rank, Warder; Prison, Holloway." He stared at the photograph for a moment, and then exclaimed—

"Well, I'm hanged! You have worked this out neatly, doctor! and so quick too. We'll have