Herbal ms Florence 106 (1400 ca)

[MarcoP]

Hi Marco,
 
This alchemical cipher alphabet, or relatively minor variations of it, seems to have been used fairly widely. There's a similar one in Vigenère's Traité des chiffres ou secrètes manières d'écrire, published much later in 1586:

Thank you, Hubert! I was not aware that the alphabet had also been connected with alchemy!