The Law of Psychic Phenomena by Thomson Jay Hudson is a pioneering work of psychical research, offering a rational and systematic framework for understanding hypnosis, telepathy, mediumship, and mental healing. Hudson introduces the "dual mind" theory, dividing human consciousness into objective (logical) and subjective (intuitive) faculties, and explains how this model can account for paranormal phenomena without invoking the supernatural. Balancing scientific skepticism with open-minded inquiry, Hudson's work helped shape early psychology, spiritualism, and mind science movements. A landmark of rational occultism, this book still resonates with those exploring the boundaries between mind, science, and spirit.