I believe this was Greer's first attempt to reintroduce the practice of geomancy to the Western occult tradition in an accessible form. He explains that the Order of the Golden Dawn included geomancy in it's system, but that the instruction was not very complete or clear. His most recent book on the subject is _The Art and Practice of Geomancy_ published in 2009 by Weiser. However _Earth Divination_ seems to me to be a good start, with clear illustrations and explanations of two methods of reading a geomantic chart. Greer also gives a brief history of the science and how it relates to astrology. One advantage of geomancy is that it requires very little in the way of equipment. While one may make and consecrate a special sand table and wand, it is possible to do a reading with only pencil and paper, or with a stick and any sandy surface. Greer also includes a section on using the geomantic figures for meditation and skying or in magical operations such as constructing amulets and talismans. He also includes a translation of an original Latin work dating from the Medieval era, "Modo judicandi questiones secundum Petrum de Abano Patavinum." I'm currently in the middle of learning a different system (ogham) but have this on my list of things to try someday. Anyone interested in buying Greers in-print books should go to his blog site, Ecosophia.net, which contains links. ( )