Early phenomenology refers to the early phase of the phenomenological movement, from the 1890s until the Second World War. The figures associated with the early phenomenology are Edmund Husserl and his followers and students, particularly the members of the Göttingen and Munich Circles, as well as a number of other students of Carl Stumpf and Theodor Lipps, and excludes the later existential phenomenology inspired by Martin Heidegger. Early phenomenology can be divided into two theoretical camps: realist phenomenology, and transcendental or constitutive phenomenology. Alongside Husserl, the other editors of the Jahrbuch für Philosophie und phänomenologische Forschung, Moritz Geiger, Alexander Pfänder, Adolf Reinach, and Max Scheler, are typically identified as the fathers of early phenomenology. The end of the early phenomenology is marked by a series of historical events, including the death of Husserl in 1938, the increased influence of Heidegger, and the outbreak of the Second World War which saw the scattering and death of a number of the early phenomenologists. The end of the early phase of the phenomenological movement led by Husserl is foreshadowed by the differences between Husserl and Heidegger concerning the Encyclopædia Britannica article on 'Phenomenology'. Phenomenology prior to the Logical Investigations While Husserl's Logical Investigations are considered the foundational text in phenomenology, it is not the first. Theodor Lipps' student Alexander Pfänder published his Phänomenologie des Wollens: eine psychologische analyse in 1900, based on his dissertation of 1899, which was a work in phenomenology conceived as descriptive psychology. During the 1890s, Husserl's phenomenology was in its developmental stages. The origins of Husserl's phenomenology can be traced back to his unpublished essay Intentional Objects, which dates as far back as 1894. The Logical Investigations (1900/01) and the Munich Invasion Shortly before his appointment as professor at the University of Göttingen in 1901, Husserl published the first edition of his Logical Investigations. In Volume I of this work, the Prolegomena to Pure Logic, Husserl presents his now famous polemic against logical psychologism - the attempt to reduce the laws of logic to psychological laws. The term 'phenomenology' only appears once in the first edition of Volume I, in a footnote to section 57. Volume II introduces Husserl's phenomenology, which he characterizes as both a science of essences and as a descriptive psychology that aims to serve as a groundwork for a radical critique of knowledge. In outlining the phenomenological project of the Logical Investigations, Husserl writes: It