Ok, forget about my previous question (and sorry for giving you too generic and misleading suggestions).
all I ask now is only the name of the manuscript.
According to many people that studied it, it's written in an unknown script or code (the set of characters or graphemes), as you prefer to call it, and with a language whose structure seems very different from all of the known languages (or, anyway, a cipher that nobody, including the cryptographers that worked successfully on the "Enigma code" breach in 2nd World War, has managed to decipher).
Some experts have also supposed that it's a hoax, and that the author would have used an encryption instrument known as "Cardan grille" to produce the text.
It has many illustrations, including strange plants, naked bodies, astronomy objects, that helped to make some suppositions about the content: there can be found six sections, each one covering a different matter...astronomy, biology, herbal, and so on.
Now the manuscript is in Yale university.