 In a further break with the Kantian tradition, the role of causation as conceptually primitive is reconsidered. It is difficult to pinpoint Reichenbach’s position between 1915 and 1935 since his writings mix epistemic and metaphysical issues. In his thesis (1915b) and in “Stetige Wahrscheinlichkeitsfolgen” (1929L) Reichenbach is committed to individual deterministic causal events. In “The Causal Structure of the World” (1925d) probability is regarded as the more fundamental concept. In later years Reichenbach often cited this paper as an anticipation of the indeterminism of quantum theory, because his account allows the possibility that finer and finer measures will not converge to deterministic laws (see Gerner, 1997, p. 153). In “Causality and Probability” (1930g) causality explicitly refers to regularities in populations rather than to particular events, a view whose source Reichenbach attributes to Ludwig Boltzmann’s development of the theory of gases. The separation of causality and probability, and the recasting of causality as a higher level concept, required that Reichenbach find a new foundation for probability. Presumably due to the influence of his colleague Richard von Mises, Reichenbach moved towards a view of probability as a property of sequences. 