In spite of Chesterton's liberal production of books, it is not altogether simple to classify them into "periods," in the manner beloved of the critic, nor even to sort them out according to subjects. G.K.C. can (and generally does) inscribe an Essay on the Nature of Religion into his novels, together with other confusing ingredients to such an extent that most readers would consider it pure pedantry on the part of anybody to insist that a Chestertonian romance need differ appreciably from a Chestertonian essay, poem, or criticism. That a book by G.K.C. should describe itself as a novel means little more than that its original purchasing price was four shillings and sixpence. It might also contain passages of love, hate, and other human emotions, but then again, it might not.