Title from old cataloging. Colophon: "Explicit summa de naturalibus contra curiosos." Written in informal littera bastarda in brownish ink in two columns with shoulder headings. Initial letters are in red and blue with pen-work decoration. The colophon on f. 102v gives the scribe's name Johannes De Luxia and date 17 Jan. 1444. Bound in old vellum over boards. In a tray case, 29 cm. The vellum binding and paste-downs are from a missal written in a gothic rotunda hand in two columns in red and black. Ff. i recto and 101v contain 2 musical compositions signed by Simon Gantius and dated 18 Dec. 1529. MS Typ 292. Houghton Library, Harvard University. Also available in an electronic version. Microfilm available in the Houghton Reading Room (reel 42 no. 12).