 Almost exclusively, Reichenbach’s scientific interest was in physics. He regarded chemistry as an appendage, entirely reducible to physics, and his only publication touching the subject is on Marcelin Bertholot (Reichenbach, 1927a), the eminent French anti-vitalist chemist. Of biology, Reichenbach leaves open (at least in 1929) the serious possibility that life exhibits phenomena that cannot be explained by physical laws, and of evolution he remarks that it has disappointed in failing to explain “the problem of life” (1929g, Section 2). He believed Freud’s psychoanalytic theories were scientifically warranted by Freud’s evidence, and in Los Angeles maintained friendships in the psychoanalytic community, including attending and sometimes lecturing at the Psychoanalytic Institute. As a student Reichenbach showed some interest in psychology (Padovani, 2008, p. 13), however, except for brief passages in Experience and Prediction (1938c), Reichenbach published nothing about psychology, and we have no evidence regarding how familiar he was with Freud’s publications. It seems unlikely that Reichenbach knew Freud’s remarkably candid descriptions before 1900 of his aggressive data collection procedures, and of course Freud’s letters to Wilhelm Fleiss (Masson, 1986), which reveal how little Freud thought of his own methodology, were unknown to Reichenbach. 