Remarks on the architecture of Brentano’s philosophical program

This paper is about Brentano’s philosophical program in Vienna and the overall architecture, which binds together the main parts of his philosophy. I argue that this program is based on Brentano’s project of philosophy as science and it aims to account for the unity of the main branches of his philosophy. The paper is divided into six parts. The first bears on Brentano’s philosophy of history, which is an important piece of the program. The second is on the close relationship between philosophy and science, and the third is on Brentano’s classification of theoretical sciences. In the three remaining parts of the paper, I examine the two main axes of the program, i.e. psychology and metaphysics, and the question how the three normative sciences are rooted in psychology. In the conclusion, I argue that Brentano’s theory of the four phases in the history of philosophy provides his philosophical program with a justification.