In two stories, Darcy encounters a magical reference to E. E. "Doc" Smith's Lensman series: King's Messengers, couriers who identify themselves with a be-gemmed badge that glows red for its owner, and only its owner. The spell on the badge is said to be invented by magician Sir Edward Elmer in the Thirties, and to have remained secret ever since. "E.E." was short for Edward Elmer, and the badges are a reference to a device which preceded the Lens which gave the Lensmen their name.