Codex Definition

I wasn't sure of the meaning of Codex - so I looked it up. Embarrassingly I looked at Wikipedia - but it served its purpose i suppose: "A codex (Latin caudex for "trunk of a tree" or block of wood, book; plural codices) is a book in the format used for modern books, with multiple signatures (two, four, or eight sheets which are folded, stitched, and bound), then typically bound together and given a cover. Developed by the Romans from wooden writing tablets, its gradual replacement of the scroll, the dominant form of book in the ancient world, has been termed the most important advance in the history of the book prior to the invention of printing.[1] The spread of the codex is often associated with the rise of Christianity, which adopted the format for the Bible early on.[2] First described by the 1st century AD Roman poet Martial, who already praised its convenient use, the codex achieved numerical parity with the scroll around 300 AD, and had completely replaced it throughout the now Christianised Greco-Roman world by the 6th century.[3] The codex holds considerable practical advantages over other book formats, such as compactness, sturdiness, ease of reference (a codex is random access, as opposed to a scroll, which is sequential access), and especially economy; unlike the scroll, both recto and verso could be used for writing.[4] Although the change from rolls to codices roughly coincides with the transition from papyrus to parchment as favourite writing material, the two developments are quite unconnected. In fact, any combination of codices and scrolls on the one hand with papyrus and parchment on the other is technically feasible and well attested from the historical record.[5] Although technically any modern paperback is a codex, the term is now reserved for manuscript (hand-written) books which were produced from Late Antiquity through the Middle Ages. The scholarly study of these manuscripts from the point of view of the bookbinding craft is called codicology, while the study of ancient documents in general is called paleography."