“The reason I ask is that if Weiss is attempting to poison this man, the coachman is almost certain to be a confederate and might be a relative. You had better examine him closely if you get another chance.”

“I will. And that brings me back to the question, what am I to do? Ought I to report the case to the police?”

“I am inclined to think not. You have hardly enough facts. Of course, if Mr. Weiss has administered poison ‘unlawfully and maliciously’ he has committed a felony, and is liable under the Consolidation Acts of 1861 to ten years’ penal servitude. But I do not see how you could swear an information. You don’t know that he administered the poison⁠—if poison has really been administered⁠—and you cannot give any reliable name or any address whatever. Then there is the question of sleeping sickness. You reject it for medical purposes, but you could not swear, in a court of law, that this is not a case of sleeping sickness.”

“No,” I admitted, “I could not.”