ENThe article contains the texts of 15 letters from 1877–1902, kept in the Historical Archive in Vilnius (Lietuvos vyriausiojo archyvaro tarnyba), in a set in the Vilnius Science Society. It is a correspondence of Zygmunt Gloger (1845–1919) – a folklore expert, archaeologist, cultural historian, author of Encyklopedia staropolska [Old Polish Encyclopaedia] – with Jan Karłowicz (1836–1903) – editor of the geographical and ethnographic monthly Wisła, and author of Słownik gwar polskich [Dictionary of the Polish Sub-Dialects]. These letters are accompanied by extensive comments, explaining the essence of the issues raised in the correspondence and familiarising the reader with the persons referred to.