Northcote Thomas provides an lengthy study of the history and practice of crystal gazing. He covers techniques for scrying utilizing a crystal sphere as an aid in clairvoyance and obtaining visions. A chapter on the incantation or "call" is included. In additional to practical techniques, the work covers the crystal ball's history. Thomas spends two chapters in an in depth discussion of Egyptian scrying.




An early work on the subject, originally published in 1905.