Besides an occultist of the first rank, Dion Fortune was an accomplished medium, acquainted at first hand with the methods, technicalities and practical problems of trance mediumship-including the different types of beings one may meet. This book contains her original work Spiritualism in the Light of Occult Science, with commentaries that quote extensively from her other writings on the subject, including transcripts from her own trance work and rare articles from old magazines and journals.