In the philosophical heritage of Kazimierz Twardowski the comparatively small work "Franz Brentano and the History of Philosophy' is probably not very important. But the breath of a new day and new ideas make it available nowadays, a hundred years after its first publication in Vienna.¹ This work is a summary or a detailed review of Franz Brentano's paper "The Four Phases of Philosophy and Its Contemporary Stage', in which the Brentanian historical-philosophical conception is put forward.²