The Friendly Daemon, or the Generous Apparition / Being a True Narrative of a Miraculous Cure, Newly Perform'd Upon That Famous Deaf and Dumb Gentleman, Dr. Duncan Campbel, by a Familiar Spirit That Appear'd to Him in a White Surplice, Like a Cathedral Singing Boy

A first-person narrator describes a prolonged, debilitating affliction of convulsions, impaired speech and sight, and repeated failures of conventional remedies. After attempts with physicians, home cures, and cold baths, the narrator attributes recovery to a miraculous intervention by a familiar spirit appearing in a white surplice like a cathedral singing boy. The narrative blends medical detail, personal testimony, reflections on providence and belief in apparitions, and gratitude toward friends and caregivers who witnessed or aided the healing.