Origin of the general Opinions respecting Demonology among Mankind-The Belief in the Immortality of the Soul is the main inducement to credit its occasional reappearance-The Philosophical Objections to the Apparition of an Abstract Spirit little understood by the Vulgar and Ignorant-The situations of excited Passion incident to Humanity, which teach Men to wish or apprehend Supernatural Apparitions-They are often presented by the Sleeping Sense-Story of Somnambulism -The Influence of Credulity contagious, so that Individuals will trust the Evidence of others in despite of their own Senses-Examples from the Historia Verdadera of Bernal Dias del Castillo, and from the Works of Patrick Walker-The apparent Evidence of Intercourse with the Supernatural World is sometimes owing to a depraved state of the bodily Organs-Difference between this Disorder and Insanity, in which the Organs retain their tone, though that of the Mind is lost-Rebellion of the Senses of a Lunatic against the current of his Reveries -Narratives of a contrary nature, in which the Evidence of the Eyes overbore the Conviction of the Understanding -Example of a London Man of Pleasure-Of Nicolai, the German bookseller and Philosopher-Of a Patient of