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A codex (from the Latin ''caudex'' for "trunk of a tree" or ''block of wood'', ''book''; plural ''codices'') is a book constructed of a number of sheets of paper, vellum, papyrus, or similar materials, with hand-written content.〔Oxford English Dictionary, 2nd ed: Codex: "a manuscript volume"〕 The book is usually bound by stacking the pages and fixing one edge, and using a cover thicker than the sheets. Some codices are continuously folded like a concertina. The alternative to paged codex format for a long document is the continuous scroll. Examples of folded codices include the Maya codices. Sometimes people use the term for a book-style format, including modern printed books but excluding folded books. The Romans developed the form from wooden writing tablets. The codex's gradual replacement of the scroll—the dominant book form in the ancient world—has been called the most important advance in book making before the invention of printing. The codex transformed the shape of the book itself, and offered a form that lasted for centuries.〔 Lyons, M., (2011). ''Books: A Living History'', London: Thames & Hudson, p. 8〕 The spread of the codex is often associated with the rise of Christianity, which adopted the format for use with the Bible early on. First described by the 1st-century AD Roman poet Martial, who praised its convenient use, the codex achieved numerical parity with the scroll around AD 300,〔"Codex" in ''The Oxford Dictionary of Byzantium'', Oxford University Press, New York & Oxford, 1991, p. 473. ISBN 0195046528〕 and had completely replaced it throughout the now Christianised Greco-Roman world by the 6th century. ==Advantages== The codex provides considerable advantages over other book formats: * Compactness * Sturdiness * Economic use of materials by using both sides (recto and verso) * Ease of reference (A codex accommodates random access, as opposed to a scroll, which uses sequential access.) The change from rolls to codices roughly coincides with the transition from papyrus to parchment as the preferred writing material, but the two developments are unconnected. In fact, any combination of codices and scrolls with papyrus and parchment is technically feasible and common in the historical record. The codex began to replace the scroll almost as soon as it was invented. In Egypt, by the fifth century, the codex outnumbered the scroll by ten to one based on surviving examples. By the sixth century, the scroll had almost vanished as a medium for literature.〔Roberts, Colin H., and Skeat, T.C. (1987), ''The Birth of the Codex''. London: Oxford University Press for the British Academy, p. 75.〕 Technically, even modern paperbacks are codices, but publishers and scholars reserve the term for manuscript (hand-written) books produced from Late antiquity until the Middle Ages. The scholarly study of these manuscripts from the point of view of the bookbinding craft is called codicology. The study of ancient documents in general is called paleography. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Codex」の詳細全文を読む スポンサード リンク
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