The Kórnik Library holds many early printed books from the former church of the Unity of the Brethren in Leszno, including an adligat, i.e. a volume combining three works: one by John Calvin and two by Matthias Flacius. This artefact was bound in recycled parchment inscribed with text by an eminent philosopher/scholastic logician, Gilbert de la Porrée; it is a fragment of Commentarius ad Epistolas S. Pauli.
The author of the article compares the text of the Commentary from the parchment cover to other hand-written copies of this work. On the sidelines of reflections concerning the authorship of the treatises attributed to Gilbert, he points out that the research in this scope has not yet taken into account an analysis of the rhythmics. The text which survived on the cover has the form of rhythmic prose – a different one than that in one of Gilbert’s letters.