  Schlick’s earlier epistemological insights, as well as the conventionalist framework developed in his work on the Special Theory, set the stage for his thought in the two works which distinguish his pre-Positivist era: General Theory of Knowledge (largely composed in 1916, with its first edition appearing in 1918 and the second edition in 1925) and Space and Time in Contemporary Physics. (Engler 2009, 130 fn. 51)  (Space and Time … appeared for the first time in 1917 as an extended essay in the prestigious journal, Die Naturwissenschaften; soon it was re-issued in three more editions and eventually translated into eleven languages). Before explaining how Schlick’s epistemology embraced the new physics, it is necessary, first of all, to consider how he further developed his earlier epistemological insights.