This book has been given me by Erix Logan, who, years ago, meet the widow of this magician, Rene' Mutti. He helped her to clear her garage, and found boxes of this booklet, sold by the magician at his shows. The book is an expose' of the methods of psychic phenomena in the fifties. Erix destroyed a big part of these books, and gave the others to the CMI, who then sent them to their members. The book is now very scarce (250 copies exist).