Water, earth and air

[Jorge_Stolfi]

those hundreds of female figures are a personification of the fixed stars.

I grant that they may represent fixed stars in the Zodiac section. (Although each division of those diagrams is more likely to correspond to one degree on the Ecliptic; and that degree may or may not have a corresponding fixed star.  And since there is also an explicit star in each sector, the nymph would be kinda redundant...)

But on the Bio section, again, there is nothing that suggests that the nymphs may be stars.  The way they are arranged does not seem compatible with that claim.  The activities they are engaged in are not the sort of things one expects would be associated with stars.

It is more likely that the nymphs in both sections are purely decorative, as human figures are in many astrological treaties.  

I believe that most of the illustrations are spurious and not part of the book's contents at all:

• In the herbal sections, the contents is just the text, and maybe some part of the plant, like the root or the leaves.
  
• In the Zodiac section, the contents of each page is only the text in the rings, the list of the 15 or 30 labels, and the approximate period of the year that those labels refer to.  The order of the labels was part of the contents (even though we cannot get it yet).  The number of rays in each star may be signficant (but I doubt it).  The nymphs, tubs, circles, and the figurative signs at the center are just decoration.
  
• In the Cosmo section, again, the contents of each page is usually the text and the labels in the diagrams, including their order. Perhaps the number of stars in each sector is significant, possibly also the number of rays they have.  On f68r3, the diagram may be specifying the position and appearance of the Pleiades.  On some pages, like f68v3, the diagram may contain significant "topological" information, like "the four rives that feed the Heavens alternate with the four rivers that water the Earth" and "the World is at the center of the Universe, and it is divided into three realms - Earth, Sea, and Pea Soup".   But some of these apparently geographic/astronomical details may have been copied by the Scribe, from some book like that Oresme, just for its decorative value.
  
• And in Bio, the contents is again just the text, the tubes and organs (without the nymphs and other frills), the labels next to them, and maybe the general shape of the pools and tubs -- if the contents of the section is indeed not about anatomy but about a certain spa with reputedly medicinal hot water pools and springs and tubs.
  
• In the Rosette's page, the main contents is general geography of the imaginary/mythical/symbolic archipelago that is the theme of that page.  The presence of a castle there, a tsunami there, a volcano over there, etc. may be significant, but their detailed shapes and styles probably are not.  The wolkenbands probably have their usual meaning.   Maybe the tubes represent something, but their number and position may be just arbitrary.  Much of what we see is, surely or probably, just meaningless decoration.
  

I think it is important to realize that, if we strip away everything that is or may be just decoration added by an European Scribe/Artist, nothing of what remains can be connected to the European culture of the time.

All the best, --stolfi