The 1815 essay "Ueber die Gottheiten zu Samothrake" ("On the Divinities of Samothrace") was ostensibly a part of a larger work, "Weltalter" ("The Ages of the World"), frequently announced as ready for publication, but of which little was ever written. Schelling planned "Weltalter" as a book in three parts, describing the past, present, and future of the world; however, he began only the first part, rewriting it several times and at last keeping it unpublished. The other two parts were left only in planning. Christopher John Murray describes the work as follows: