THE purpose of this book is to present to the student of Theosophy a condensed synthesis of the information at present (1926) available concerning the Astral Body of man, together with a description and explanation of the astral world and its phenomena. The book is thus a natural sequel of The Etheric Double and Allied Phenomena published in 1925. As in the case of The Etheric Double, the compiler has consolidated the information obtained from a large number of books, a list of which is given, arranging the material, which covers a vast field and is exceedingly complex, as methodically as lay within his power. It is hoped that by this means present and future students of the subject will be saved much labour and research, being able not only to find the information they require presented in a comparatively small compass, but also, with the help of the marginal references, to refer, should they so desire, to the original sources of information. In order that the book may fulfil its purpose by being kept within reasonable dimensions, the general plan followed has been to expound the principles under-lying astral phenomena, omitting particular examples or instances. Lecturers and others who wish specific illustrations of the principles enunciated, will find the marginal references useful as a clue to the places where the examples they seek may be found.—A. E. Powell