Preface 5 Secret Treasury: "Witchcraft Books" (Taufer Bucher) of Old Europe ErikdePou 17 "The Book of Evil Spirits, or Goetia": The Origin and Story of Stephen Skinner and David Rankine 52 Ritual Evocation of Spirits and the Science of the Early Modern Era: Humphrey Gilbert's Experiments with the Magic Crystal Frank Claassen 100 Invocation with Magic Crystals and Mirrors Frederick Hockley 140 Bronze head Aleister Crawley 164