He passed the letter over to the foreman of the jury, and turned to the witness-box.
"I conclude, Mr. Epplewhite, that the late Mayor left that letter in your possession?" he asked.
"He did, sir," replied Epplewhite. "He said, half jokingly, 'You can keep that, Epplewhite! If they sacrifice me on the altar of vested interests, it'll be a bit of evidence.' So I locked up the letter in my safe there and then, and it has remained there until this morning."
"You, of course, have no idea as to the identity of the sender?"
"None, sir!"
"Had Mr. Wallingford?"
"Neither of us, sir, formed any conclusion. But we both thought that the letter emanated from some member of the opposition."
"Did Mr. Wallingford take it as a serious threat?"
Epplewhite looked doubtful.