1923. Being a treatise on metapsychics. Contents: concerning metapsychics in general; Subjective Metapsychics: on subjective metapsychics in general; on cryptesthesia (lucidity) in general; experimental cryptesthesia; divining rod; metapsychicism in animals; sporadic cryptesthesia; premonitions; Objective Metapsychics: objective metapsychics in general; movements of objects, telekinesis;ectoplasms (materializations); levitations; bilocations; hauntings.