"Tractado da spera do mundo" is a translation of Sacro Bosco's Tractatus de sphaera (Sphaera mundi) with title (P. 25 of facsim.) : Tractado da spera do mundo tyrada de latim em liguoagem com ha carta que huũ grande doutoz aleman mandon ao rey de purtugall dom Joham et segũdo. The letter follows the text of Sacro Bosco, without caption or spacing (p. 60 of facsim., Line 24), and begins : A cartta que enuiou hieronima moñtario douto alemã da cidade de nozũb'ga em alemania ao serenissimo rey dõ Joham o segũdo de portugail ... It is dated July 14, 1493.

P. 60-62 contain a letter from Hieronymus Münzer to King John II., dated Nuremberg, July 14, 1493, which is catalogued separately; it is discussed on p. 17, 18 of the introduction.