The paper contains texts with explanations of so far unpublished letters by Sygurd Wiśniowski (1841-1892) - a traveler, polyglot, author of articles published in periodicals in many foreign countries, and also literary texts unknown to a wider public - to Józef Ignacy Kraszewski, one of the most eminent and productive Polish novelists. The letters come from the years 1877-1881, and touch upon a number of vital subjects.