 Students of Hempel have found it very difficult to avoid the impression that Hempel was not only defending the position that every adequate scientific explanation is potentially predictive but also the position that every adequate scientific prediction is potentially explanatory. This impression is powerfully reinforced in “The Theoretician’s Dilemma” (Hempel 1958), where, in the course of demonstrating that the function of theories goes beyond merely establishing connections between observables, he offers this passage: