In The Codex, published in 1954, C.H. Roberts studied the process by which in the early centuries of our era the roll as the vehicle for literature was replaced by the codex, which has remained the format of the book ever since. New evidence that has accumulated in the last thirty years has set some of the problems in a new light and in this book, published here for the first time in paperback, the authors re-examine these and offer a different explanation for the remarkable part in the transformation played by the early Church.