The author, devoting more than forty-five years to psychical research, presents in this book his definite conclusions on the subject. Some of the following chapters appeared in The Journal and in other publications. Contents: new spiritual awakening; haunted houses; Eusapia Palladino; greatest mental medium of all time, Mrs. Piper; laboratory investigations in psychic phenomena; trumpet mediums; intra-atomic quantity; poltergeist phenomena; how spirit pictures are faked; psychic photographs; visions and voices of Jeanne D'Arc (Joan of Arc); problem of the mind-body relation; free will and determinism in the light of psychic phenomena; yoga and magic.