The original ‘perfect’ binding, like a paperback wherein the leaves are not sewn but glued as a book block directly onto the cloth spine has failed, as is always the case once the glue dries completely out, loses its flexibility, and perishes. Thus, we have a sequence of disbound leaves and plates. With the original casing (the cloth torn along spine margins). The perfect binding could be created, or the leaves sewn into sections and rebound properly. A binding copy of an influential work.