The article deals with the issue of Polish encyclopedism of the 18th and 19th centuries against the background of the European Baroque and Enlightenment trends. The phenomenon of the encyclopaedia by B. Chmielowski, I. Krasicki, F.S. Jezierski was analysed in the text. These were works that did not follow a specific and consistent pattern of encyclopaedic publications, were not popular and did not occupy a permanent place in Polish science and literature. Other ephemeral encyclopaedia initiatives taken into account by the author were undertaken without due patronage, and — as research has shown — were secondary and amateur publications. Some attempts, such as the Encyklopedia powszechna. Zbiór wiadomości dla wszystkich stanów of the Glücksbergs from 1839, or the Mała Polska Encyklopedia by S. Plater did not manage to achieve success. Only the creation of S. Orgelbrand’s Encyklopedia powszechna in 1859 filled a significant gap in the Polish publishing and writing “market”. The article also takes into account the statements of the creators and authors of the encyclopaedia regarding the patterns they used for creating such works, and a partial analysis of the megastructure, microstructure and publishing framework of these works.