The facts of Spiritism are of two classes and have two aspects. Those heretofore published have generally possessed the seductive fascination that surrounds mystery, and have been represented as harmless, elevating, and spiritualizing. The author was conducted through the open portals into the chambers of "mystic lights," and then beyond into the dismal shades of Tartarus and the foul atmospheres of the abyss. If the horrors of these regions were ever before experienced, the fact has never to our knowledge been recorded. Since every investigator desires to understand the "basic principles" underlying every new phenomenon, the author is impelled to disclose important facts divulged to him; and these facts are understated rather than exaggerated. Nor does he shrink from the censure or odium which some may heap upon him for his temerity in undertaking to investigate these mysteries and publish the facts.