Uwagi metajęzykowe w Informacyi matematycznej Wojciecha Bystrzonowskiego (1749)

The paper aims at reviewing remarks that refer to language, being contained in the Informacya matematyczna by Wojciech Bystrzonowski. The Informacya was a popular compendium focused on dissemination of traditional natural, mathematical and technical knowledge. Nevertheless, Bystrzonowski took a keen interest in linguistic problems and therefore there are some observations in the text of his encyclopaedia on: etymology of selected toponyms, anthroponyms and appellatives, sources of borrowings, functional differentiation of the Polish language, and linguistic custom.