Enlarged diagram on f68v2-f68v1?

[ololololo]

Note that this T-O map is anomalous: it has two quarters at top and a half-circle below.

Couldn't the author just turn it around? 

Perhaps... But the topic of Oresme's book Le livre du ciel et du monde was the creation of Heavens and Earth.  In that illustration, where he is shown presenting the book to some big shot, the circle has water in the bottom half, and land partly covered with forest on the top half -- just as in the Genesis story. 

All the best, --stolfi

Undoubtedly, there are similarities. But this meaning is not suitable for VMS if it is not a theoretical but a practical book (i.e. gives specific medical knowledge). The author has no need to know how the world was created and to look at such schemes.