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A codex (Latin caudex for "trunk of a tree" or block of wood, book; plural codices) is a book made up of a number of sheets of paper, vellum, papyrus, or similar, with hand-written content, usually stacked and bound by fixing one edge and with covers thicker than the sheets, but sometimes continuous and folded concertina-style. The alternative to paged codex format for a long document is the continuous scroll. Examples of folded codices are the Maya codices. Sometimes the term is used for a book-style format, including modern printed books but excluding folded books.
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 before the invention of printing. The codex altogether transformed the shape of the book itself and offered a form that lasted for centuries. The spread of the codex is often associated with the rise of Christianity, which adopted the format for 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, and had completely replaced it throughout the now Christianised Greco-Roman world by the 6th century.
The codex holds considerable practical advantages over other book formats, such as compactness, sturdiness, ease of reference (a codex allows random access, as opposed to a scroll, which uses sequential access), and especially economy of materials; unlike the scroll, both recto and verso could be used for writing. Although the change from rolls to codices roughly coincides with the transition from papyrus to parchment as favourite writing material, the two developments are 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.
The codex began to replace the scroll (or roll), 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, and by the sixth century the scroll had almost vanished from use as a medium for literature.
Although technically even modern paperbacks are codices, the term is now used only for manuscript (hand-written) books which were 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.
The Romans used precursors made of reusable wax-covered tablets of wood for taking notes and other informal writings. Two ancient polyptychs, a pentatych and octotych, excavated at Herculaneum employed a unique connecting system that presages later sewing on thongs or cords. Julius Caesar may have been the first Roman to reduce scrolls to bound pages in the form of a note-book, possibly even as a papyrus codex. At the turn of the 1st century AD, a kind of folded parchment notebook called pugillares membranei in Latin became commonly used for writing in the Roman Empire. This term was used by both the Classical Latin poet Martial and the Christian apostle Paul. Martial used the term with reference to gifts of literature exchanged by Romans during the festival of Saturnalia. According to T.C. Skeat “…in at least three cases and probably in all, in the form of codices" and he theorized that this form of notebook was invented in Rome and then “…must have spread rapidly to the Near East…” In his discussion of one of the earliest parchment codices to survive from Oxyrhynchus in Egypt, Eric Turner seems to challenge Skeat’s notion when stating “…its mere existence is evidence that this book form had a prehistory” and that “early experiments with this book form may well have taken place outside of Egypt.” Early codices of parchment or papyrus appear to have been widely used as personal notebooks, for instance in recording copies of letters sent (Cicero Fam. 9.26.1). The pages of parchment notebooks were commonly washed or scraped for re-use, called a palimpsest; and consequently writings in a codex were considered informal and impermanent.
As far back as the early 2nd century, there is evidence that the codex—usually of papyrus—was the preferred format among Christians: in the library of the Villa of the Papyri, Herculaneum (buried in AD 79), all the texts (Greek literature) are scrolls (see Herculaneum papyri); in the Nag Hammadi "library", secreted about AD 390, all the texts (Gnostic Christian) are codices. Despite this comparison, a fragment of a non-Christian parchment Codex of Demosthenes, De Falsa Legatione from Oxyrhynchus in Egypt demonstrates that the surviving evidence is insufficient to conclude whether Christians played a major, if not central, role in the development of early codices, or if they simply adopted the format to distinguish themselves from Jews. The earliest surviving fragments from codices come from Egypt and are variously dated (always tentatively) towards the end of the 1st century or in the first half of the 2nd. This group includes the Rylands Library Papyrus P52, containing part of St John's Gospel, and perhaps dating from between 125 and 160.
In Western culture the codex gradually replaced the scroll. From the 4th century, when the codex gained wide acceptance, to the Carolingian Renaissance in the 8th century, many works that were not converted from scroll to codex were lost to posterity. The codex was an improvement over the scroll in several ways. It could be opened flat at any page, allowing easier reading; the pages could be written on both front and back (recto and verso); and the codex, protected within its durable covers, was more compact and easier to transport.
The codex also made it easier to organize documents in a library because it had a stable spine on which the title of the book could be written. The spine could be used for the incipit, before the concept of a proper title was developed, during medieval times.
Although most early codices were made of papyrus, papyrus was fragile and supplies from Egypt, the only place where papyrus grew and was made into paper, became scanty; the more durable parchment and vellum gained favor, despite the cost.
The codices of pre-Columbian Mesoamerica had the same form as the European codex, but were instead made with long folded strips of either fig bark (amatl) or plant fibers, often with a layer of whitewash applied before writing. New World codices were written as late as the 16th century (see Maya codices and Aztec codices). Those written before the Spanish conquests seem all to have been single long sheets folded concertina-style, sometimes written on both sides of the local amatl paper.
In the Far East, the scroll remained standard for far longer than in the West. There were intermediate stages, such as scrolls folded concertina-style and pasted together at the back and books that were printed only on one side of the paper. Judaism still retains the Torah scroll, at least for ceremonial use.
Among the experiments of earlier centuries, scrolls were sometimes unrolled horizontally, as a succession of columns. (The Dead Sea Scrolls are a famous example of this format.) This made it possible to fold the scroll as an accordion. The next step was then to cut the folios, sew and glue them at their centers, making it easier to use the papyrus or vellum recto-verso as with a modern book. In traditional bookbinding, these assembled folios trimmed and curved were called "codex" in order to differentiate it from the "case" which we now know as "hard cover". Binding the codex was clearly a different procedure from binding the "case".
The first stage in creating a codex is to prepare the animal skin. The skin is washed with water and lime, but not together, and it has to soak in the lime for a couple of days. The hair is removed and the skin is dried by attaching it to a frame called a herse. The parchment maker attaches the skin at points around the circumference. The skin is attached to the herse by cords; to prevent tearing, the maker wraps the area of the skin to which the cord is to be attached around a pebble called a pippin. After that is complete, the maker will use a crescent shaped knife, called a lunarium or lunellum, to clean any surviving hairs. Once the skin is completely dry, it will be given a deep clean, and it will be processed into sheets. The number of sheets out of a piece of skin depends on the size of the skin and the given dimensions requested by the order. For example, the average calfskin can provide three and half medium sheets of writing material. This can be doubled when it is folded into two conjoint leaves, also known as a bifolium. Historians have found evidence of manuscripts where the scribe wrote down the medieval instructions now followed by modern membrane makers. Defects can often be found in the membrane, whether from the original animal, human error during the preparation period, or from when the animal was killed. Defects can also appear during the writing process. Unless it is kept in perfect condition, defects can appear later in the manuscript’s life as well.
First the membrane must be prepared. The first step is to set up the quires. The quire is a group of several sheets put together. Raymond Clemens and Timothy Graham point out, in "Introduction to Manuscript Studies", that “the quire was the scribe’s basic writing unit throughout the Middle Ages”. They note “Pricking is the process of making holes in a sheet of parchment (or membrane) in preparation of it ruling. The lines were then made by ruling between the prick marks...The process of entering ruled lines on the page to serve as a guide for entering text. Most manuscripts were ruled with horizontal lines that served as the baselines on which the text was entered and with vertical bounding lines that marked the boundaries of the columns.”
The scribe, usually a monk, would decide on what his quire (four folded sheets) would look like, by arranging the hair and flesh sides of the sheets. Throughout time, from the Carolingian period and all the way up to the Middles Ages, different styles of folding the quire came about. For example, in mainland Europe throughout the Middle Ages, the quire would be put into a system which each side would fold on to the same style. The hair side would meet the hair side and the same goes with the flesh side. This was not the same style used in the British Isles, where the membrane would be folded so that it turned out an eight leaf quire, with single leaves in the third and sixth positions. The next stage was tacking the quire. Tacking is when the scribe would hold together the leaves in quire with thread. Once threaded together, the scribe would then sew a line of parchment up the “spine” of the manuscript, as to protect the tacking.