The text of this little book is the joint work of Mr Leadbeater and myself; some of it has already appeared as an article in Lucifer (now the Theosophical Review), but the greater part of it is new. The drawing and painting of the Thought-Forms observed by Mr Leadbeater or by myself, or by both of us together, has been done by three friends—Mr John Varley, Mr Prince, and Miss Macfarlane, to each of whom we tender our cordial thanks.