Abstract
Hans Kleinpeter provided a popularization of both Ernst Mach's thought and the scientific philosophy that forerun the foundation of the Vienna Circle. Between 1912 and 1913 Kleinpeter published the articles that one finds here in their first Italian translation; they concern a comparison between Mach's epistemology and Nietzsche's thought, and are thus an original contribution to the reception of the latter's philosophy. In these texts Kleinpeter anticipates some of the ideas he later presented in his work devoted to the 'Phenomenalistic' worldview, whose - according to him - Nietzsche has been one of the main upholders, as much as Mach.