 Brentano in the meantime had become a professor in 1874 in Vienna, where he continued to develop his philosophical views in the same spirit as he did in Würzburg, with no other method but that of the natural sciences. An important distinction that Brentano came to make in his lectures in Vienna, however, was that between two branches of psychology (Brentano, [eds.] Baumgartner and Chisholm 1982). One of these was descriptive psychology, also called descriptive phenomenology or psychognosy, and was concerned with analyzing consciousness into its elements and specifying their modes of combination. The other branch, genetic psychology, was to be concerned with causal explanations of mental phenomena. Though Brentano maintained that the latter branch required physiological investigations and also that physiology was not yet developed enough to deal with matters in genetic psychology, he thought that he had already contributed to descriptive psychology in his Psychology from an Empirical Standpoint (Brentano 1874) and continued making further elaborations in this area through his lectures.