"That is the letter!" said that gentleman.

Average Jones turned the paper and found, upon an inside page, the
strange advertisement from 74 Bellair Street.

"One more question, Professor," said he. "When did you last see Mr.
Craig?"

"Nine or ten days ago. I think it was July 2."

"How did he impress you?"

"As being somewhat preoccupied. Otherwise normal."

"Was his face swollen then?"

"No."

"Where did you see him?"

"The first time at my laboratory, about eleven o'clock."

"You saw him again that day, then?"

"Yes. We met by accident at a little before two P.M. on
Twenty-third Street. I was surprised, because he had told me he had
to catch a noon train and return to his work."

"Then he hadn't done so?"