"Fifty Sealed Message Reading Methods"
(Burling Hull) is shown in original manuscript form with silver board covers, and in the subsequent hardbound UK "Demon Series" release by L. Davenport and Maskelyne's Mysteries. In this classic treatise Hull tackles in his introduction a problem continually attendant upon the mentalist:
"...I feel that the magician is quite within his rights in presenting mind reading tricks at this time. If it does no more than to awaken more general interest in and investigation of GENUINE PSYCHIC PHENOMENA, (note I do not say Spiritualistic which is quite a different matter) which undoubtedly exist, he will be fully justified."