The present research is concerned with Edmund Husserl’s reception of psychologism, one of his main problems, especially in his second volume masterpiece Logische Untersuchungen: Prolegomena zur reinen Logik, our thematic focus. The kind of psychologism, therefore, one here approaches to is psychologism as presented and refuted in Prolegomena. This sort of psychologism, which one shall later call “logical psychologism”, must be understood against a background in which some historical and thematic phenomena matter. In broader terms, these phenomena concerns the development of logic and mathematics and, ipso facto, the very philosophical context of which Edmund Husserl and his work are a fraction. In sum, one does not aim at a mere description of the phenomenon of psychologism, but one seeks a real understanding of the problem and why Husserl sees it as such.