This book is a faithful record, so far as I can make it, of the most marvelous phenomena which have come under my observation during the last sixteen or seventeen years. I have used my notes (made immediately after the sittings) and also my reports to the American Psychical Society (of which I was at one time a director) as the basis of my story. For literary purposes I have substituted fictitious names for real names, and imaginary characters for the actual individuals concerned; but I have not allowed these necessary expedients to interfere with the precise truth of the account.
