"Is this the paper that you found in the safe?" asked the counsel, once more handing the leaflet across.
"Yes; this is the paper."
"What happened next?"
"The following afternoon I was sent for by Mr. Singleton, of the Finger-print Department. He informed me that he had gone through the files and had not been able to find any thumb-print resembling the one on the paper, and recommended me to endeavour to obtain prints of the thumbs of any persons who might have been concerned in the robbery. He also gave me an enlarged photograph of the thumb-print for reference if necessary. I accordingly went to St. Mary Axe and had an interview with Mr. Hornby, when I requested him to allow me to take prints of the thumbs of all the persons employed on the premises, including his two nephews. This he refused, saying that he distrusted finger-prints and that there was no suspicion of anyone on the premises. I asked if he would allow his nephews to furnish their thumb-prints privately, to which he replied, 'Certainly not.'"
"Had you then any suspicion of either of the nephews?"
"I thought they were both open to some suspicion. The safe had certainly been opened with false keys, and as they had both had the real keys in their possession it was possible that one of them might have taken impressions in wax and made counterfeit keys."
"Yes."
"I called on Mr. Hornby several times and urged him, for the sake of his nephews' reputations, to sanction the taking of the thumb-prints; but he refused very positively and forbade them to submit, although I understood that they were both willing. It then occurred to me to try if I could get any help from Mrs. Hornby, and on the fifteenth of March I called at Mr. Hornby's private house and saw her. I explained to her what was wanted to clear her nephews from the suspicion that rested on them, and she then said that she could dispose of those suspicions at once, for she could show me the thumb-prints of the whole family: she had them all in a 'Thumbograph.'"
"A 'Thumbograph'?" repeated the judge. "What is a 'Thumbograph'?"
Anstey rose with the little red-covered volume in his hand.
"A 'Thumbograph,' my lord," said he, "is a book, like this, in which foolish people collect the thumb-prints of their more foolish acquaintances."
He passed the volume up to the judge, who turned over the leaves curiously and then nodded to the witness.
"Yes. She said she had them all in a 'Thumbograph.'"
"Then she fetched from a drawer a small red-covered book which she showed to me. It contained the thumb-prints of all the family and some of her friends."
"Is this the book?" asked the judge, passing the volume down to the witness.
The sergeant turned over the leaves until he came to one which he apparently recognised, and said—
"Yes, m'lord; this is the book. Mrs. Hornby showed me the thumb-prints of various members of the family, and then found those of the two nephews. I compared them with the photograph that I had with me and discovered that the print of the left thumb of Reuben Hornby was in every respect identical with the thumb-print shown in the photograph."
"What did you do then?"
"I asked Mrs. Hornby to lend me the 'Thumbograph' so that I might show it to the Chief of the Finger-print Department, to which she consented. I had not intended to tell her of my discovery, but, as I was leaving, Mr. Hornby arrived home, and when he heard of what had taken place, he asked me why I wanted the book, and then I told him. He was greatly astonished and horrified, and wished me to return the book at once. He proposed to let the whole matter drop and take the loss of the diamonds on himself; but I pointed out that this was impossible as it would practically amount to compounding a felony. Seeing that Mrs. Hornby was so distressed at the idea of her book being used in evidence against her nephew, I promised her that I would return it to her if I could obtain a thumb-print in any other way.
"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 similibus curantur. Well?"
"When I arrested him, I administered the usual caution, and the prisoner then said, 'I am innocent. I know nothing about the robbery.'"
The counsel for the prosecution sat down, and Anstey rose to cross-examine.
"You have told us," said he, in his clear musical voice, "that you found at the bottom of the safe two rather large drops of a dark fluid which you considered to be blood. Now, what led you to believe that fluid to be blood?"
"I took some of the fluid up on a piece of white paper, and it had the appearance and colour of blood."
"Was it examined microscopically or otherwise?"
"Not to my knowledge."
"Was it quite liquid?"
"Yes, I should say quite liquid."
"What appearance had it on paper?"
"It looked like a clear red liquid of the colour of blood, and was rather thick and sticky."
Anstey sat down, and the next witness, an elderly man, answering to the name of Francis Simmons, was called.
"You are the housekeeper at Mr. Hornby's premises in St. Mary Axe?" asked Sir Hector Trumpler.
"I am."
"Did you notice anything unusual on the night of the ninth of March?"
"I did not."
"Did you make your usual rounds on that occasion?"
"Yes. I went all over the premises several times during the night, and the rest of the time I was in a room over the private office."
"Who arrived first on the morning of the tenth?"
"Mr. Reuben. He arrived about twenty minutes before anybody else."
"What part of the building did he go to?"
"He went into the private office, which I opened for him. He remained there until a few minutes before Mr. Hornby arrived, when he went up to the laboratory."
"Who