As far as we are aware no previous attempt has been made to classify the various regions of the Astral World on any logical or scientific basis. We therefore endeavor to present the subject in a way that can be readily grasped, not only by students Of the occult, but by the average intelligent reader. Although there is no sharp demarcation between the Realms herein described, they are not entirely arbitrary divisions, for they follow and correspond to the seven-fold division Of man and nature so well known to students. We are well aware that there is a certain group of mental scientists, such as the followers Of Hudson, Warman, etc., who consider all manifestations Of the Astral World as due to the subconscious mind, suggestion, auto-suggestion, telepathy from the liv ing, hypnosis, etc. While we cheerfully admit the in?uence Of all these factors, as described herein, they still leave unexplained large gaps in our knowl edge Of the Astral World and much Of the undeniable phenomena unaccounted for.