M. d'Avrigny

Chapter 79 - Lemonade

M. d'Avrigny — aliases: the doctor

Dr. d'Avrigny arrives to treat Barrois, identifies the symptoms as poisoning, and interrogates the servant about the lemonade. He performs a chemical test with syrup of violets and lemonade that turns emerald, confirming the presence of false angostura, and diagnoses Barrois's death.