  Emerging from the tradition of the philosophical physicists, Schlick’s early thought bears the marks of his intellectual legacy. After the completion of his graduate study in physics, Schlick soon turned his attention to philosophy (Schlick 2006a).  Within a few short years he had written a youthfully enthusiastic ethical tract in 1908, called Lebensweisheit, a lucid analysis of concept-formation called “The Boundaries of Scientific and Philosophical Concept-Formation” (1910), as well as a substantial essay on “The Nature of Truth in Modern Logic” (1910) (Schlick 2006b; Schlick 1979a, 25–40, 41–103). In “The Boundaries…”, Schlick provided a broad sketch of his understanding of scientific thought, which identifies the aim of science as the reduction of phenomena to relationships governed by law, thus exhibiting individual events as special cases of universal, exceptionless regularities. Science is expressed mathematically, in spatio-temporal form to provide for exact measurement. And the individual sciences are demarcated by distinctive intensive qualities, as ‘mass’ distinguishes mechanics, ‘heat’ thermodynamics, etc. Although the methods of mathematico-scientific concept-formation reduces the entire natural world to purely quantitative relations, it is powerless in the face of irreducible pure qualities. This is the task of philosophy so that philosophy becomes the theory of qualities. Schlick’s work on “The Nature of Truth in Modern Logic” not only provides a broad survey of treatments of truth then current in German philosophy, but it also introduces an original view of truth as univocal designation. A judgment, as a structured complex of its constituents, is coordinated with the fact which consists of the entities signified by the judgment’s constituents, arranged in a way which is coordinated with the structure of the particular judgment. When the constituents are structured in a judgment so that the whole judgment univocally designates a situation in the world, then the judgment is true; otherwise, it is false. The conception of truth as univocal coordination figured prominently in Schlick’s pre-Positivist theory of knowledge.