Abstract

Moritz Schlick was the leader of the Vienna Circle, that distinguished group of analytic thinkers who played such an important role in the second quarter of this century that in the words of Sir A. J. Ayer "no subsequent work of any philosophical interest has been unaf fected by it. " Inspired by the unparalleled achievements of the natural sciences and of mathematics Schlick and his colleagues strove to bring about through new and exacting methods of analysis a revo lution in philosophy which would be crowned with accomplishments that would parallel those of the sciences. Such a revolution did take place - not in Vienna but in the English speaking world and elsewhere. At its base lay the discovery (due to Gottlob Frege) that logic is neither tied to thinking nor to natural language and Schlick had correctly identified the turning point in philosophy as the mo ment in which this discovery was made and exploited. Henceforth the key-problems in philosophy of science, epistemology, ethics and philosophy of language were to be stated with maximum preci sion, their central concepts subjected to careful analysis, the results rigorously systematized and, wherever possible, axiomatized. The authors who followed the invitation to celebrate the Cen tennial in these pages, have been in one way or another affected by the Vienna Circle.