The bishop had declared that, unless all books mentioned in the Catholic Index
of forbidden books were purged from the Institut's library, its members and even its visitors would be subject to excommunication.
The study concludes with the ways in which the De Brys dealt with censorship, especially by the Catholic Index
and the impact of the works both at the time of publication and today.
Morandi's climb up the social ladder began in Florence, where he joined the circle around Giovanni de' Medici and, in his company, became an expert in the occult arts of alchemy and a reader of books on the Catholic Index
by such authors as Paracelsus, Telesio, and Reuchlin.