The volume begins at fol.172, so it was clearly once bound with other preceding texts:
"De / Precetti della Lege Divina / Sacramenti, Simbolo et / altre cose della Doctrina / Cristiana"
A clipping from an English dealer's catalogue repeats this title, and states that it was "unbound":
Google Books led me to a tantalising snippet of the description of the manuscript in a 1904 Sotheran catalogue:
and Mitch Fraas at Penn kindly sent me a scan of more of the page:
I have not been able to identify the text, but it is perhaps this, which has the same incipit ("Chiama la sacra scriptura"), here attributed to St Bernardino of Siena.