“I then took the ‘Thumbograph’ to Scotland Yard and showed it to Mr. Singleton, who agreed that the print of the left thumb of Reuben Hornby was in every respect identical with the thumb-print on the paper found in the safe. On this I applied for a warrant for the arrest of Reuben Hornby, which I executed on the following morning. I told the prisoner what I had promised Mrs. Hornby, and he then offered to allow me to take a print of his left thumb so that his aunt’s book should not have to be used in evidence.”
“How is it, then,” asked the judge, “that it has been put in evidence?”
“It has been put in by the defence, my lord,” said Sir Hector Trumpler.
“I see,” said the judge. “‘A hair of the dog that bit him.’ The ‘Thumbograph’ is to be applied as a remedy on the principle that similia
