7 81 ESSAY ON SUPERSTITION; BEING AN INQUIRY INTO THE EFFECTS OF PHYSICAL INFLUENCE ON THE MIND, IN THE PRODUCTION OF DREAMS, VISIONS, GHOSTS, AND AUTHOR OF A TRIBUTE OF SYMPATHY, THE PRINCIPLES OF PHYSICAL, "And when they shall say unto you, seek unto them that have familiar spirits, and LONDON: J. HATCHARD AND SON, 187, PICCADILLY. 1830. TO THE RIGHT REVEREND THE LORD BISHOP OF WINCHESTER, &c. &c. &c. MY LORD, Allow me to express my gratitude for your Lordship's, permission to place the following pages under your protection; and for the kind interest with which you have noticed and facilitated their progress. Possessing the privilege of near access to your Lordship, and bound by far other ties than those which subsist between an Author and his Patron, a labour under |