Voynich manuscript
The Voynich manuscript is an illustrated codex hand-written in an otherwise unknown writing system, referred to as 'Voynichese'. The vellum on which it is written has been carbon-dated to the early 15th century (1404–1438), and stylistic analysis indicates it may have been composed in Italy during the Italian Renaissance. The origins, authorship, and purpose of the manuscript are debated. Various hypotheses have been suggested, including that it is an otherwise unrecorded script for a natural language or constructed language; an unread code, cypher, or other form of cryptography; or simply a meaningless hoax. The manuscript currently  consists of around 240 pages, but there is evidence that additional pages are missing. Some pages are foldable sheets of varying size. Most of the pages have fantastical illustrations or diagrams, some crudely coloured, with sections of the manuscript showing people, fictitious plants, astrological symbols, etc. The text is written from left to right. The manuscript is named after Wilfrid Voynich, a Polish book dealer who purchased it in 1912. Since 1969, it has been held in Yale University's Beinecke Rare Book and Manuscript Library. The Voynich manuscript has been studied by many professional and amateur cryptographers, including American  and British codebreakers from both World War I and World War II. The manuscript has never been demonstrably deciphered, and none of the many hypotheses proposed over the last hundred years have been independently verified. The mystery of its meaning and origin has excited the popular imagination, making it the subject of study and speculation. Yale University published the manuscript online in its entirety - 225 pages - in their digital collections library. Description. Codicology. The codicology, or physical characteristics of the manuscript, has been studied by researchers. The manuscript measures , with hundreds of vellum pages collected into 18 quires. The total  number of pages is around 240, but the exact number depends on how the manuscript's unusual foldouts are counted. The quires have been numbered from 1 to 20 in various locations, using numerals consistent with the 1400s, and the top righthand corner of each "recto" (righthand) page has been numbered from 1 to 116, using numerals of a later date. From the various numbering gaps in the quires and pages, it seems likely that, in the past, the manuscript had at least 272 pages in 20 quires, some of which were already missing when Wilfrid Voynich acquired the manuscript  in 1912. There is strong evidence that many of the book's bifolios were reordered at various points in its history, and that the original page order may well have been quite different from what it is today. Parchment, covers, and binding. Samples from various parts of the manuscript were radiocarbon dated at the University of Arizona in 2009. The results were consistent for all samples tested and indicated a date for the parchment between 1404 and 1438. Protein testing in 2014 revealed that the parchment was made from calf skin, and multispectral analysis showed that it had not been  written on before the manuscript was created (i.e., it is not a palimpsest). The parchment was created with care, but deficiencies exist and the quality is assessed as average, at best. The parchment is prepared from "at least fourteen or fifteen entire calfskins". Some folios (e.g., 42 and 47) are thicker than the usual parchment. The goat skin binding and covers are not original to the book, but date to its possession by the Collegio Romano. Insect holes are present on the first and last folios of the manuscript in the current order and suggest that a wooden cover was  present before the later covers. Discolouring on the edges points to a tanned-leather inside cover. Ink. Many pages contain substantial drawings or charts which are colored with paint. Based on modern analysis using polarized light microscopy (PLM), it has been determined that a quill pen and iron gall ink were used for the text and figure outlines. The ink of the drawings, text, and page and quire numbers have similar microscopic characteristics. In 2009, energy-dispersive X-ray spectroscopy (EDS) revealed that the inks contained major amounts of carbon, iron, sulfur, potassium and calcium with trace amounts of copper  and occasionally zinc. EDS did not show the presence of lead, while X-ray diffraction (XRD) identified potassium lead oxide, potassium hydrogen sulphate, and syngenite in one of the samples tested. The similarity between the drawing inks and text inks suggested a contemporaneous origin. Paint. Colored paint was applied (somewhat crudely) to the ink outlined figures, possibly at a later date. The blue, white, red-brown, and green paints of the manuscript have been analyzed using PLM, XRD, EDS, and scanning electron microscopy (SEM). The pigments used were deemed inexpensive. Retouching. Computer scientist Jorge Stolfi of the University of Campinas  highlighted that parts of the text and drawings have been modified, using darker ink over a fainter, earlier script. Evidence for this is visible in various folios, for example "f1r", "f3v", "f26v", "f57v", "f67r2", "f71r", "f72v1", "f72v3" and "f73r". Text. Every page in the manuscript contains text, mostly in an unidentified language, but some have extraneous writing in Latin script. The bulk of the text in the 240-page manuscript is written in an unknown script, running left to right. Most of the characters are composed of one or two simple pen strokes. There exists some dispute as to whether  certain characters are distinct, but a script of 20–25 characters would account for virtually all of the text; the exceptions are a few dozen rarer characters that occur only once or twice each. There is no obvious punctuation. Much of the text is written in a single column in the body of a page, with a slightly ragged right margin and paragraph divisions and sometimes with stars in the left margin. Other text occurs in charts or as labels associated with illustrations. There are no indications of any errors or corrections made at any place in the document. The ductus  flows smoothly, giving the impression that the symbols were not enciphered; there is no delay between characters, as would normally be expected in written encoded text. Extraneous writing. Only a few of the words in the manuscript are thought to have not been written in the unknown script: Transcription. Various transcription alphabets have been created to equate Voynich characters with Latin characters to help with cryptanalysis, such as the Extensible (originally: European) Voynich Alphabet (EVA). The first major one was created by the "First Study Group", led by cryptographer William F. Friedman in the 1940s, where each line of the  manuscript was transcribed to an IBM punch card to make it machine readable. Statistical patterns. The text consists of over 170,000 characters, with spaces dividing the text into about 35,000 groups of varying length, usually referred to as "words" or "word tokens" (37,919); 8,114 of those words are considered unique "word types." The structure of these words seems to follow phonological or orthographic laws of some sort; for example, certain characters must appear in each word (like English vowels), some characters never follow others, or some may be doubled or tripled, but others may not. The distribution of letters within  words is also rather peculiar: Some characters occur only at the beginning of a word, some only at the end (like Greek ς), and some always in the middle section. Many researchers have commented upon the highly regular structure of the words. Professor Gonzalo Rubio, an expert in ancient languages at Pennsylvania State University, stated: Stephan Vonfelt studied statistical properties of the distribution of letters and their correlations (properties which can be vaguely characterized as rhythmic resonance, alliteration, or assonance) and found that under that respect Voynichese is more similar to the Mandarin Chinese pinyin text of the "Records of  the Grand Historian" than to the text of works from European languages, although the numerical differences between Voynichese and Mandarin Chinese pinyin look larger than those between Mandarin Chinese pinyin and European languages. Practically no words have fewer than two letters or more than ten. Some words occur in only certain sections, or in only a few pages; others occur throughout the manuscript. Few repetitions occur among the thousand or so labels attached to the illustrations. There are instances where the same common word appears up to three times in a row (see "Zipf's law"). Words that differ by  only one letter also repeat with unusual frequency, causing single-substitution alphabet decipherings to yield babble-like text. In 1962, cryptanalyst Elizebeth Friedman described such statistical analyses as "doomed to utter frustration". In 2014, a team led by Diego Amancio of the University of São Paulo published a study using statistical methods to analyse the relationships of the words in the text. Instead of trying to find the meaning, Amancio's team looked for connections and clusters of words. By measuring the frequency and intermittence of words, Amancio claimed to identify the text's keywords and produced three-dimensional models  of the text's structure and word frequencies. The team concluded that, in 90% of cases, the Voynich systems are similar to those of other known books, indicating that the text is in an actual language, not random gibberish. Linguists Claire Bowern and Luke Lindemann have applied statistical methods to the Voynich manuscript, comparing it to other languages and encodings of languages, and have found both similarities and differences in statistical properties. Character sequences in languages are measured using a metric called h2, or second-order conditional entropy. Natural languages tend to have an h2 between 3 and 4, but  Voynichese has much more predictable character sequences, and an h2 around 2. However, at higher levels of organization, the Voynich manuscript displays properties similar to those of natural languages. Based on this, Bowern dismisses theories that the manuscript is gibberish. It is likely to be an encoded natural language or a constructed language. Bowern also concludes that the statistical properties of the Voynich manuscript are not consistent with the use of a substitution cipher or polyalphabetic cipher. As noted in Bowern's review, multiple scribes or "hands" may have written the manuscript, possibly using two methods of encoding at least  one natural language. The "language" Voynich A appears in the herbal and pharmaceutical parts of the manuscript. The "language" known as Voynich B appears in the balneological section, some parts of the medicinal and herbal sections, and the astrological section. The most common vocabulary items of Voynich A and Voynich B are substantially different. Topic modeling of the manuscript suggests that pages identified as written by a particular scribe may relate to a different topic. In terms of morphology, if visual spaces in the manuscript are assumed to indicate word breaks, there are consistent patterns that suggest a three-part  word structure of prefix, root or midfix, and suffix. Certain characters and character combinations are more likely to appear in particular fields. There are minor variations between Voynich A and Voynich B. The predictability of certain letters in a relatively small number of combinations in certain parts of words appears to explain the low entropy (h2) of Voynichese. In the absence of obvious punctuation, some variants of the same word appear to be specific to typographical positions, such as the beginning of a paragraph, line, or sentence. The Voynich word frequencies of both variants appear to conform to a Zipfian  distribution, supporting the idea that the text has linguistic meaning. This has implications for the encoding methods most likely to have been used, since some forms of encoding interfere with the Zipfian distribution. Measures of the proportional frequency of the ten most common words is similar to those of the Semitic, Iranian, and Germanic languages. Another measure of morphological complexity, the Moving-Average Type–Token Ratio (MATTR) index, is similar to Iranian, Germanic, and Romance languages. Illustrations. The illustrations are conventionally used to divide most of the manuscript into six different sections, since the text cannot be read. Each  section is typified by illustrations with different styles and supposed subject matter except for the last section, in which the only drawings are small stars in the margin. The following are the sections and their conventional names: Five folios contain only text, and at least 28 folios are missing from the manuscript. Purpose. The overall impression given by the surviving leaves of the manuscript is that it was meant to serve as a pharmacopoeia or to address topics in medieval or early modern medicine. However, the puzzling details of the illustrations have fueled many theories about the book's origin , the contents of its text, and the purpose for which it was intended. The first section of the book is almost certainly herbal, but attempts have failed to identify the plants, either with actual specimens or with the stylized drawings of contemporaneous herbals. Only a few of the plant drawings can be identified with reasonable certainty, such as a wild pansy and the maidenhair fern. The herbal pictures that match pharmacological sketches appear to be clean copies of them, except that missing parts were completed with improbable-looking details. In fact, many of the plant drawings in the herbal section  seem to be composite: the roots of one species have been fastened to the leaves of another, with flowers from a third. The basins and tubes in the balneological section are sometimes interpreted as implying a connection to alchemy, yet they bear little obvious resemblance to the alchemical equipment of the period. Astrological considerations frequently played a prominent role in herb gathering, bloodletting, and other medical procedures common during the likeliest dates of the manuscript. However, interpretation remains speculative, apart from the obvious Zodiac symbols and one diagram possibly showing the classical planets. History. Much of the early history of  the book is unknown, though the text and illustrations are all characteristically European. In 2009, University of Arizona researchers radiocarbon dated the manuscript's vellum to between 1404 and 1438. In addition, McCrone Associates in Westmont, Illinois found that the paints in the manuscript were of materials to be expected from that period of European history. There have been erroneous reports that McCrone Associates indicated that much of the ink was added not long after the creation of the parchment, but their official report contains no statement of this. The first confirmed owner was Georg Baresch, a 17th-century alchemist  from Prague. Baresch was apparently puzzled about this "Sphynx" that had been "taking up space uselessly in his library" for many years. He learned that Jesuit scholar Athanasius Kircher from the Collegio Romano had published a Coptic (Egyptian) dictionary and claimed to have deciphered the Egyptian hieroglyphs; Baresch twice sent a sample copy of the script to Kircher in Rome, asking for clues. The 1639 letter from Baresch to Kircher is the earliest known mention of the manuscript to have been confirmed. Whether Kircher answered the request or not is not known, but he was apparently interested enough to try  to acquire the book, which Baresch refused to yield. Upon Baresch's death, the manuscript passed to his friend Jan Marek Marci (also known as Johannes Marcus Marci), then rector of Charles University in Prague. A few years later, Marci sent the book to Kircher, his longtime friend and correspondent. Marci also sent Kircher a cover letter (in Latin, dated 19 August 1665 or 1666) that was still attached to the book when Voynich acquired it: The "Dr. Raphael" is believed to be Raphael Sobiehrd-Mnishovsky, and the sum would be about 2 kg of gold. While Wilfrid Voynich took  Raphael's claim at face value, the Bacon authorship theory has been largely discredited. However, a piece of evidence supporting Rudolph's ownership is the now almost invisible name or signature, on the first page of the book, of Jacobus Horcicky de Tepenecz, the head of Rudolph's botanical gardens in Prague. Rudolph died still owing money to de Tepenecz, and it is possible that de Tepenecz may have been given the book (or simply taken it) in partial payment of that debt. No records of the book for the next 200 years have been found, but in all likelihood , it was stored with the rest of Kircher's correspondence in the library of the Collegio Romano (now the Pontifical Gregorian University). It probably remained there until the troops of Victor Emmanuel II of Italy captured the city in 1870 and annexed the Papal States. The new Italian government decided to confiscate many properties of the Church, including the library of the Collegio. Many books of the university's library were hastily transferred to the personal libraries of its faculty just before this happened, according to investigations by Xavier Ceccaldi and others, and those books were exempt from confiscation. Kircher 's correspondence was among those books, and so, apparently, was the Voynich manuscript, as it still bears the "ex libris" of Petrus Beckx, head of the Jesuit order and the university's rector at the time. Beckx's private library was moved to the Villa Mondragone, Frascati, a large country palace near Rome that had been bought by the Society of Jesus in 1866 and housed the headquarters of the Jesuits' Ghislieri College. In 1903, the Society of Jesus (Collegio Romano) was short of money and decided to sell some of its holdings discreetly to the Vatican Library. The sale  took place in 1912, but not all of the manuscripts listed for sale ended up going to the Vatican. Wilfrid Voynich acquired 30 of these manuscripts, among them the one which now bears his name. He spent the next seven years attempting to interest scholars in deciphering the script, while he worked to determine the origins of the manuscript. In 1930, the manuscript was inherited after Wilfrid's death by his widow Ethel Voynich, author of the novel "The Gadfly" and daughter of mathematician George Boole. She died in 1960 and left the manuscript to her close friend Anne Nill . In 1961, Nill sold the book to antique book dealer Hans P. Kraus. Kraus was unable to find a buyer and donated the manuscript to Yale University in 1969, where it was catalogued as "MS 408", sometimes also referred to as "Beinecke MS 408". Timeline of ownership. The timeline of ownership of the Voynich manuscript is given below. The time when it was possibly created is shown in green (early 1400s), based on carbon dating of the vellum. Periods of unknown ownership are indicated in white. The commonly accepted owners of the 17th century are shown in orange; the long  period of storage in the Collegio Romano is yellow. The location where Wilfrid Voynich allegedly acquired the manuscript (Frascati) is shown in green (late 1800s); Voynich's ownership is shown in red, and modern owners are highlighted blue. Authorship hypotheses. Many people have been proposed as possible authors of the Voynich manuscript, among them Roger Bacon, John Dee or Edward Kelley, Giovanni Fontana, and Voynich. Early history. Marci's 1665/1666 cover letter to Kircher says that, according to his friend the late Raphael Mnishovsky, the book had once been bought by Rudolf II, Holy Roman Emperor and King of Bohemia  for 600 ducats (66.42 troy ounce actual gold weight, or 2.07 kg). (Mnishovsky had died in 1644, more than 20 years earlier, and the deal must have occurred before Rudolf's abdication in 1611, at least 55 years before Marci's letter. However, Karl Widemann sold books to Rudolf II in March 1599.) According to the letter, Mnishovsky (but not necessarily Rudolf) speculated that the author was 13th-century Franciscan friar and polymath Roger Bacon.<ref name="Bacon/Mnishovsky"> </ref> Marci said that he was suspending judgment about this claim, but it was taken quite seriously by Wilfrid Voynich , who did his best to confirm it. Voynich contemplated the possibility that the author was Albertus Magnus if not Roger Bacon. The assumption that Bacon was the author led Voynich to conclude that John Dee sold the manuscript to Rudolf. Dee was a mathematician and astrologer at the court of Queen Elizabeth I of England who was known to have owned a large collection of Bacon's manuscripts. Dee and his "scrier" (spirit medium) Edward Kelley lived in Bohemia for several years, where they had hoped to sell their services to the emperor. However, this sale seems quite unlikely, according  to John Schuster, because Dee's meticulously kept diaries do not mention it. If Bacon did not create the Voynich manuscript, a supposed connection to Dee is much weakened. It was thought possible, prior to the carbon dating of the manuscript, that Dee or Kelley might have written it and spread the rumor that it was originally a work of Bacon's in the hopes of later selling it. Fabrication by Voynich. Some suspect Voynich of having fabricated the manuscript himself. As an antique book dealer, he probably had the necessary knowledge and means, and a lost book by Roger  Bacon would have been worth a fortune. Furthermore, Baresch's letter and Marci's letter only establish the existence of a manuscript, not that the Voynich manuscript is the same one mentioned. These letters could possibly have been the motivation for Voynich to fabricate the manuscript, assuming that he was aware of them. However, many consider the expert internal dating of the manuscript and the June 1999 discovery of Baresch's letter to Kircher as having eliminated this possibility. Eamon Duffy says that the radiocarbon dating of the parchment (or, more accurately, vellum) "effectively rules out any possibility that the  manuscript is a post-medieval forgery", as the consistency of the pages indicates origin from a single source, and "it is inconceivable" that a quantity of unused parchment comprising "at least fourteen or fifteen entire calfskins" could have survived from the early 15th century. Giovanni Fontana. It has been suggested that some illustrations in the books of an Italian engineer, Giovanni Fontana, slightly resemble Voynich illustrations. Fontana was familiar with cryptography and used it in his books, although he did not use the Voynich script but a simple substitution cipher. In the book "Secretum de thesauro experimentorum ymaginationis hominum" (Secret  of the treasure-room of experiments in man's imagination), written c. 1430, Fontana described mnemonic machines, written in his cypher. That book and his "Bellicorum instrumentorum liber" both used a cryptographic system, described as a simple, rational cipher, based on signs without letters or numbers. Other theories. Sometime before 1921, Voynich was able to read a name faintly written at the foot of the manuscript's first page: "Jacobj à Tepenece". This is taken to be a reference to Jakub Hořčický of Tepenec, also known by his Latin name Jacobus Sinapius. Rudolph II had ennobled him in 1607, had  appointed him his Imperial Distiller, and had made him curator of his botanical gardens as well as one of his personal physicians. Voynich (and many other people after him) concluded that Jacobus owned the Voynich manuscript prior to Baresch, and he drew a link from that to Rudolf's court, in confirmation of Mnishovsky's story. Jacobus's name has faded further since Voynich saw it, but is still legible under ultraviolet light. It does not match the copy of his signature in a document located by Jan Hurych in 2003. As a result, it has been suggested that the  signature was added later, possibly even fraudulently by Voynich himself. Baresch's letter bears some resemblance to a hoax that orientalist Andreas Mueller once played on Athanasius Kircher. Mueller sent some unintelligible text to Kircher with a note explaining that it had come from Egypt, and asking him for a translation. Kircher reportedly solved it. It has been speculated that these were both cryptographic tricks played on Kircher to make him look foolish. Raphael Mnishovsky, the friend of Marci who was the reputed source of the Bacon story, was himself a cryptographer and apparently invented a cipher which he claimed  was uncrackable (c. 1618). This has led to the speculation that Mnishovsky might have produced the Voynich manuscript as a practical demonstration of his cipher and made Baresch his unwitting test subject. Indeed, the disclaimer in the Voynich manuscript cover letter could mean that Marci suspected some kind of deception. In his 2006 book, Nick Pelling proposed that the Voynich manuscript was written by 15th-century North Italian architect Antonio Averlino (also known as "Filarete"), a theory broadly consistent with the radiocarbon dating. Language hypotheses. Many hypotheses have been developed about the Voynich manuscript's "language", called "Voynichese": Ciphers. According  to the "letter-based cipher" theory, the Voynich manuscript contains a meaningful text in some European language that was intentionally rendered obscure by mapping it to the Voynich manuscript "alphabet" through a cipher of some sort—an algorithm that operated on individual letters. This was the working hypothesis for most 20th-century deciphering attempts, including an informal team of NSA cryptographers led by William F. Friedman in the early 1950s. The main argument for this theory is that it is difficult to explain a European author using a strange alphabet, except as an attempt to hide information. Indeed, even Roger  Bacon knew about ciphers, and the estimated date for the manuscript roughly coincides with the birth of cryptography in Europe as a relatively systematic discipline. The counterargument is that almost all cipher systems consistent with that era fail to match what is seen in the Voynich manuscript. For example, simple substitution ciphers would be excluded because the distribution of letter frequencies does not resemble that of any known language, while the small number of different letter shapes used implies that nomenclator and homophonic ciphers should be ruled out, because these typically employ larger cipher alphabets. Polyalphabetic ciphers were invented by  Alberti in the 1460s and included the later Vigenère cipher, but they usually yield ciphertexts where all cipher shapes occur with roughly equal probability, quite unlike the language-like letter distribution which the Voynich manuscript appears to have. However, the presence of many tightly grouped shapes in the Voynich manuscript (such as "or", "ar", "ol", "al", "an", "ain", "aiin", "air", "aiir", "am", "ee", "eee", among others) does suggest that its cipher system may make use of a "verbose cipher", where single letters in a plaintext get enciphered into groups of fake letters. For example, the first two lines of page  f15v (seen above) contain "" and "", which strongly resemble how Roman numerals such as "CCC" or "XXXX" would look if verbosely enciphered. It is possible that the text was encrypted by starting from a fundamentally simple cipher, then augmenting it by adding nulls (meaningless symbols), homophones (duplicate symbols), a transposition cipher (letter rearrangement), false word breaks, etc. Codes. According to the "codebook cipher" theory, the Voynich manuscript "words" would actually be codes to be looked up in a "dictionary" or codebook. The main evidence for this theory is that the internal structure and length distribution of many words are similar to  those of Roman numerals, which at the time would be a natural choice for the codes. However, book-based ciphers would be viable for only short messages, because they are very cumbersome to write and to read. Shorthand. In 1943, Joseph Martin Feely claimed that the manuscript was a scientific diary written in shorthand. According to D'Imperio, this was "Latin, but in a system of abbreviated forms not considered acceptable by other scholars, who unanimously rejected his readings of the text". Steganography. This theory holds that the text of the Voynich manuscript is mostly meaningless, but contains meaningful information hidden  in inconspicuous details—e.g., the second letter of every word, or the number of letters in each line. This technique, called steganography, is very old and was described by Johannes Trithemius in 1499. Though the plain text was speculated to have been extracted by a Cardan grille (an overlay with cut-outs for the meaningful text) of some sort, this seems somewhat unlikely because the words and letters are not arranged on anything like a regular grid. Still, steganographic claims are hard to prove or disprove, because stegotexts can be arbitrarily hard to find. It has been suggested that the  meaningful text could be encoded in the length or shape of certain pen strokes. There are indeed examples of steganography from about that time that use letter shape (italic vs. upright) to hide information. However, when examined at high magnification, the Voynich manuscript pen strokes seem quite natural, and substantially affected by the uneven surface of the vellum. Natural language. Statistical analysis of the text reveals patterns similar to those of natural languages. For instance, the word entropy (about 10 bits per word) is similar to that of English or Latin texts. Amancio "et al." (2013) argued that the Voynich  manuscript "is mostly compatible with natural languages and incompatible with random texts." The linguist Jacques Guy once suggested that the Voynich manuscript text could be some little-known natural language, written plaintext with an invented alphabet. He suggested Chinese in jest, but later comparison of word length statistics with Vietnamese and Chinese made him view that hypothesis seriously. In many language families of East and Central Asia, mainly Sino-Tibetan (Chinese, Tibetan, and Burmese), Austroasiatic (Vietnamese, Khmer, etc.) and possibly Tai (Thai, Lao, etc.), morphemes generally have only one syllable; and syllables have a rather rich structure, including tonal patterns . Child (1976), a linguist of Indo-European languages for the U.S. National Security Agency, proposed that the manuscript was written in a "hitherto unknown North Germanic dialect". He identified in the manuscript a "skeletal syntax several elements of which are reminiscent of certain Germanic languages", while the content is expressed using "a great deal of obscurity." In February 2014, Professor Stephen Bax of the University of Bedfordshire made public his research into using "bottom up" methodology to understand the manuscript. His method involved looking for and translating proper nouns, in association with relevant illustrations, in the context of other languages  of the same time period. A paper he posted online offers tentative translation of 14 characters and 10 words. He suggested the text is a treatise on nature written in a natural language, rather than a code. Tucker & Talbert (2014) published a paper claiming a positive identification of 37 plants, 6 animals, and one mineral referenced in the manuscript to plant drawings in the "Libellus de Medicinalibus Indorum Herbis" or Badianus manuscript, a fifteenth-century Aztec herbal. Together with the presence of atacamite in the paint, they argue that the plants were from colonial New Spain and the text represented  Nahuatl, the language of the Aztecs. They date the manuscript to between 1521 (the date of the Spanish conquest of the Aztec Empire) and "circa" 1576. These dates contradict the earlier radiocarbon date of the vellum and other elements of the manuscript. However, they argued that the vellum could have been stored and used at a later date. The analysis has been criticized by other Voynich manuscript researchers, who argued that a skilled forger could construct plants that coincidentally have a passing resemblance to theretofore undiscovered existing plants. Constructed language. The peculiar internal structure of Voynich manuscript words led William  F. Friedman to conjecture that the text could be a constructed language. In 1950, Friedman asked the British army officer John Tiltman to analyze a few pages of the text, but Tiltman did not share this conclusion. In a paper in 1967, Brigadier Tiltman said: The concept of a constructed language is quite old, as attested by John Wilkins's "Philosophical Language" (1668), but still postdates the generally accepted origin of the Voynich manuscript by two centuries. In most known examples, categories are subdivided by adding suffixes (fusional languages); as a consequence, a text in a particular subject would have  many words with similar prefixes—for example, all plant names would begin with similar letters, and likewise for all diseases, etc. This feature could then explain the repetitious nature of the Voynich text. However, no one has been able yet to assign a plausible meaning to any prefix or suffix in the Voynich manuscript. Hoax. The fact that the manuscript has defied decipherment thus far has led various scholars to propose that the text does not contain meaningful content in the first place, implying that it may be a hoax. In 2003, computer scientist Gordon Rugg showed that text with  characteristics similar to the Voynich manuscript could have been produced using a table of word prefixes, stems, and suffixes, which would have been selected and combined by means of a perforated paper overlay. The latter device, known as a Cardan grille, was invented around 1550 as an encryption tool, more than 100 years after the estimated creation date of the Voynich manuscript. Some maintain that the similarity between the pseudo-texts generated in Gordon Rugg's experiments and the Voynich manuscript is superficial, and the grille method could be used to emulate any language to a certain degree. In April  2007, a study by Austrian researcher Andreas Schinner published in "Cryptologia" supported the hoax hypothesis. Schinner showed that the statistical properties of the manuscript's text were more consistent with meaningless gibberish produced using a quasi-stochastic method, such as the one described by Rugg, than with Latin and medieval German texts. Some scholars have claimed that the manuscript's text appears too sophisticated to be a hoax. In 2013, Marcelo Montemurro, a theoretical physicist from the University of Manchester, published findings claiming that semantic networks exist in the text of the manuscript, such as content-bearing words occurring in  a clustered pattern, or new words being used when there was a shift in topic. With this evidence, he believes it unlikely that these features were intentionally "incorporated" into the text to make a hoax more realistic, as most of the required academic knowledge of these structures did not exist at the time the Voynich manuscript would have been written. In September 2016, Gordon Rugg and Gavin Taylor addressed these objections in another article in "Cryptologia", and illustrated a simple hoax method that they claim could have caused the mathematical properties of the text. In 2019, Torsten Timm and Andreas  Schinner published an algorithm that matches the statistical characteristics of the Voynich manuscript, and could have been used by a Medieval author to generate meaningless text. Glossolalia. In their 2004 book, Gerry Kennedy and Rob Churchill suggest the possibility that the Voynich manuscript may be a case of glossolalia (speaking-in-tongues), channeling, or outsider art. If so, the author felt compelled to write large amounts of text in a manner which resembles stream of consciousness, either because of voices heard or because of an urge. This often takes place in an invented language in glossolalia, usually made up of  fragments of the author's own language, although invented scripts for this purpose are rare. Kennedy and Churchill use Hildegard von Bingen's works to point out similarities between the Voynich manuscript and the illustrations that she drew when she was suffering from severe bouts of migraine, which can induce a trance-like state prone to glossolalia. Prominent features found in both are abundant "streams of stars", and the repetitive nature of the "nymphs" in the balneological section. This theory has been found unlikely by other researchers. The theory is virtually impossible to prove or disprove, short of deciphering the  text. Kennedy and Churchill are themselves not convinced of the hypothesis, but consider it plausible. In the culminating chapter of their work, Kennedy states his belief that it is a hoax or forgery. Churchill acknowledges the possibility that the manuscript is either a synthetic forgotten language (as advanced by Friedman), or else a forgery, as the preeminent theory. However, he concludes that, if the manuscript is a genuine creation, mental illness or delusion seems to have affected the author. Decipherment claims. Since the manuscript's modern rediscovery in 1912, there have been a number of claimed decipherings. William Romaine Newbold . One of the earliest efforts to unlock the book's secrets (and the first of many premature claims of decipherment) was made in 1921 by William Romaine Newbold of the University of Pennsylvania. His singular hypothesis held that the visible text is meaningless, but that each apparent "letter" is in fact constructed of a series of tiny markings discernible only under magnification. These markings were supposed to be based on ancient Greek shorthand, forming a second level of script that held the real content of the writing. Newbold claimed to have used this knowledge to work out entire paragraphs proving  the authorship of Bacon and recording his use of a compound microscope four hundred years before van Leeuwenhoek. A circular drawing in the astronomical section depicts an irregularly shaped object with four curved arms, which Newbold interpreted as a picture of a galaxy, which could be obtained only with a telescope. Similarly, he interpreted other drawings as cells seen through a microscope. However, Newbold's analysis has since been dismissed as overly speculative after John Matthews Manly of the University of Chicago pointed out serious flaws in his theory. Each shorthand character was assumed to have multiple interpretations, with no  reliable way to determine which was intended for any given case. Newbold's method also required rearranging letters at will until intelligible Latin was produced. These factors alone ensure the system enough flexibility that nearly anything at all could be discerned from the microscopic markings. Although evidence of micrography using the Hebrew language can be traced as far back as the ninth century, it is nowhere near as compact or complex as the shapes Newbold made out. Close study of the manuscript revealed the markings to be artefacts caused by the way ink cracks as it dries on rough vellum . Perceiving significance in these artefacts can be attributed to pareidolia. Thanks to Manly's thorough refutation, the micrography theory is now generally disregarded. Joseph Martin Feely. In 1943, Joseph Martin Feely published "Roger Bacon's Cipher: The Right Key Found", in which he claimed that the book was a scientific diary written by Roger Bacon. Feely's method posited that the text was a highly abbreviated medieval Latin written in a simple substitution cipher. Leonell C. Strong. Leonell C. Strong, a cancer research scientist and amateur cryptographer, believed that the solution to the Voynich manuscript was a "peculiar double system  of arithmetical progressions of a multiple alphabet". Strong claimed that the plaintext revealed the Voynich manuscript to be written by the 16th-century English author Anthony Ascham, whose works include "A Little Herbal", published in 1550. Notes released after his death reveal that the last stages of his analysis, in which he selected words to combine into phrases, were questionably subjective. Robert S. Brumbaugh. In 1978, Robert Brumbaugh, a professor of classical and medieval philosophy at Yale University, claimed that the manuscript was a forgery intended to fool Emperor Rudolf II into purchasing it, and that the text is Latin  enciphered with a complex, two-step method. John Stojko. In 1978, John Stojko published "Letters to God's Eye", in which he claimed that the Voynich Manuscript was a series of letters written in vowelless Ukrainian. The theory caused some sensation among the Ukrainian diaspora at the time, and then in independent Ukraine after 1991. However, the date Stojko gives for the letters, the lack of relation between the text and the images, and the general looseness in the method of decryption have all been criticised. Stephen Bax. In 2014, applied linguistics Professor Stephen Bax self-published a paper claiming  to have translated ten words from the manuscript using techniques similar to those used to successfully translate Egyptian hieroglyphs. He claimed the manuscript to be a treatise on nature, in a Near Eastern or Asian language, but no full translation was made before Bax's death in 2017. Nicholas Gibbs. In September 2017, television writer Nicholas Gibbs claimed to have decoded the manuscript as idiosyncratically abbreviated Latin. He declared the manuscript to be a mostly plagiarized guide to women's health. Scholars judged Gibbs' hypothesis to be trite. His work was criticized as patching together already-existing scholarship with a  highly speculative and incorrect translation; Lisa Fagin Davis, director of the Medieval Academy of America, stated that Gibbs' decipherment "doesn't result in Latin that makes sense." Greg Kondrak. Greg Kondrak, a professor of natural language processing at the University of Alberta, and his graduate student Bradley Hauer used computational linguistics in an attempt to decode the manuscript. Their findings were presented at the Annual Meeting of the Association for Computational Linguistics in 2017, in the form of an article suggesting that the language of the manuscript is most likely Hebrew, but encoded using alphagrams, i.e. alphabetically ordered anagrams. However , the team admitted that experts in medieval manuscripts who reviewed the work were not convinced. Ahmet Ardıç. In 2018, Ahmet Ardıç, an electrical engineer with an interest in Turkic languages, claimed in a YouTube video that the Voynich script is a kind of Old Turkic written in a 'poetic' style. The text would then be written using 'phonemic orthography', meaning the author spelled out words as they heard them. Ardıç claimed to have deciphered and translated over 30% of the manuscript. His submission to the journal "Digital Philology" was rejected in 2019. Gerard Cheshire. In 2019, Cheshire, a biology research  assistant at the University of Bristol, made headlines for his theory that the manuscript was written in a "calligraphic proto-Romance" language. He claimed to have deciphered the manuscript in two weeks using a combination of "lateral thinking and ingenuity." Cheshire has suggested that the manuscript is "a compendium of information on herbal remedies, therapeutic bathing, and astrological readings", that it contains numerous descriptions of medicinal plants and passages that focus on female physical and mental health, reproduction, and parenting; and that the manuscript is the only known text written in proto-Romance. He further claimed: "The manuscript was compiled  by Dominican nuns as a source of reference for Maria of Castile, Queen of Aragon." Cheshire claims that the fold-out illustration on page 158 depicts a volcano, and theorizes that it places the manuscript's creators near the island of Vulcano which was an active volcano during the 15th century. However, experts in medieval documents disputed this interpretation vigorously, with the executive director of the Medieval Academy of America, Lisa Fagin Davis, denouncing the paper as "just more aspirational, circular, self-fulfilling nonsense". Approached for comment by "Ars Technica", Davis gave this explanation: The University of Bristol subsequently removed  a reference to Cheshire's claims from its website, referring, in a statement, to concerns about the validity of the research and stating: "This research was entirely the author's own work and is not affiliated with the University of Bristol, the School of Arts nor the Centre for Medieval Studies". Facsimiles. Many books and articles have been written about the manuscript. Copies of the manuscript pages were made by alchemist Georgius Barschius (the Latinized form of the name of Georg Baresch; cf. the second paragraph under "History" above) in 1637 and sent to Athanasius Kircher, and later by Wilfrid  Voynich. In 2004, the Beinecke Rare Book and Manuscript Library made high-resolution digital scans publicly available online, and several printed facsimiles appeared. In 2016, the Beinecke Library and Yale University Press co-published a facsimile, "The Voynich Manuscript", with scholarly essays. The Beinecke Library also authorized the production of a print run of 898 replicas by the Spanish publisher Siloé in 2017. Cultural influence. The manuscript has also inspired several works of fiction, including the following: