First published in 1969, The Logic of Empirical Theories by Marian Przelecki is a seminal work in the philosophy of science. It explores key themes such as formalism of empirical theories, semantics of formalized languages, interpretation of empirical theories and theoretical terms, meaning postulates for theoretical terms, and the main types of statements within empirical theories. This is an important work for its contribution to understanding the foundations of empirical sciences and remains a valuable resource for philosophers.