Positivism and the Real External World & Positivism and Realism

This volume includes the first English translation of Max Planck's lecture Positivism and the Real External World (translated by Fritz Lewertoff and André Michaud) and a new publication of Moritz Schlick's response Positivism and Realism. This valuable book should be of interest to experts, students and all interested in the question of the nature of scientific theories, i.e., what science tells us about the external world.