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.

The holdings of the Kórnik Library include a book of abstracts of lawsuits concerning the boundaries of estates in Greater Poland in the 15th–17th century, written in Latin. Its presumed author, the otherwise unknown Piotr Biernacki, had the ability to write in both the Latin and the Cyrillic alphabet. This article focuses on the reading and the palaeographic and linguistic analysis of several Latin sentences, one heading and more than 20 margin notes written in the Cyrillic alphabet. The Cyrillic handwriting found in the book is a Russian skoropis used in Ukrainian areas of Poland in the 17th century. When writing the Latin text with the Cyrillic alphabet, the author utilised the Polish language of the time in the reading of Latin. The cryptograms found in the book have a technical/informative nature and do not contribute any significant information to the text. In combination with the fact that the Cyrillic alphabet was not at all used in Greater Poland, the above suggests that the author was playing with the reader, who was thus forced to look for the meaning of the incomprehensible text.