The book ""The Astral Plane of Theosophy and the Fourth Dimension"" by Alexander Horne is a comprehensive exploration of the esoteric concepts of the astral plane and the fourth dimension. The author delves into the teachings of Theosophy, a spiritual philosophy that seeks to understand the nature of the universe and humanity's place within it. The book discusses the astral plane, which is believed to be a realm of existence beyond the physical world,...