Anticipating some thematic cores which would have occupied his reflection in the following years, Husserl examines the correlation between Nature and Spirit: a relationship which is not to be intended as an index of unidirectionality but, on the contrary, of mutual necessity. The fenomenological research assumes the burden of rediscovering the essential unity of both spheres by tapping into that precise horizon of sense which was forgotten by the specialist sciences producing, in this way, some burdensome misunderstandings: the reign of primeval evidences (Lebenswelt), which is taken as the central theme by the eidetic radical science which establishes and positions, with great epistemological scrupulousness and with high methodical rigor, all of possible sciences.
