This volume constitutes the Proceedings and Discussions of the 1968 Salzburg Colloquium in the Philosophy of Science. The Colloquium was held at the Institut fUr Wissenschaftstheorie of the Internationales Forschungszentrum fUr Grundfragen der Wissenschaften, Salzburg, Austria, from August 28 to August 31, 1968, under the joint auspices of the Division of Logic, Methodology and Philosophy of Science of the International Union of History and Philosophy of Science, and the Institut fur Wissenschaftstheorie of the Internationales Forschungs- zentrum, Salzburg. The Colloquium was organized by an...