However, Feigl’s mature conception of a synthesis of scientific realism and logical empiricism is to be found in his 1950 article “Existential Hypotheses” (published in Philosophy of Science). There, it was semantics which served as the vehicle for Feigl’s promotion of the realist project. By ‘semantics,’ Feigl meant (in a nutshell) the formal scrutiny of reference and truth (see Feigl 1950a, p. 36). As such, it had nothing to do with the concrete methods of testing hypotheses. Rather, “semantic