Mr. Mappin sat up stiffly in his chair. "Do you remember my showing you all at Glencader a needle which had on its point enough poison to kill a man?"
"And leave no trace—yes."
"Do you remember that you all looked at it with interest, and that Mr. Fellowes examined it more attentively than any one else?"
"I remember."
"Well, I was going to kill a collie with it next day."
"A favourite collie grown old, rheumatic—yes, I remember."
"Well, the experiment failed."
"The collie wasn't killed by the poison?"
"No, not by the poison, Mr. Stafford."
"So your theory didn't work except on paper."