Nightmare Abbey, a venerable family-mansion, in a highly picturesque state of semi-dilapidation, pleasantly situated on a strip of dry land between the sea and the fens, at the verge of the county of Lincoln, had the honour to be the seat of Christopher Glowry, Esquire. This gentleman was naturally of an atrabilarious temperament, and much troubled with those phantoms of indigestion which are commonly called blue devils.