Mystery attracts mystery. Ever since the wide appearance of my name as a performer of unexplained feats, I have encountered strange narratives and events which my calling has led people to link with my interests and activities. Some of these have been trivial and irrelevant, some deeply dramatic and absorbing, some productive of weird and perilous experiences and some involving me in extensive scientific and historical research. Many of these matters I have told and shall continue to tell very freely; but there is one of which I speak with great reluctance, and which I am now relating only after a session of grilling persuasion from the publishers of this magazine, who had heard vague rumors of it from other members of my family.