De Arte Chimica - On Alchemy

As Kristeller noticed, the author of the De arte chimica stayed in Germany, and precisely «in Agrippa ciuitate», that is to say in Cologne (Colonia Agrippina). [...]
 
Now, we know that Agrippa lived until 1507 in Cologne, a city he considered as his homeland and from which he borrowed his name - and if the form «in Agrippa ciuitate», which I have found nowhere else, is not a misreading by a transcriber or by the typographer of an abbreviation for «in Agrippina ciuitate», or even, perhaps, for «in Agrippina Colonia», we could then see it as an indirect way for Agrippa to have signed the book. Futhermore, a letter dated November 29th, 1509, sent to him from Cologne by his friend Dietrich Wichwael, bishop of Cyrene and administrator of the Archdiocese of Cologne from 1504 to his death in 1519, testifies that Agrippa actually discussed the question of astrology in this town. [...]