Perikopen, most of which is written in the same Polish-Kashubian style of Krofey's and Brüggemann's books, also contain small passages ("6th Sunday after Epiphanias") written in pure Kashubian.

Hilferding (1862) and Parczewski (1896) confirmed a progressive language shift in the Kashubian population from their Slavonic vernacular to the local West-Germanic dialect (Low German Ostpommersch or High German,