 Stumpf’s debt to Lotze’s philosophy is certainly significant but it is not very well documented. Most studies on the relationship between Stumpf and Lotze emphasize Lotze’s theory of local signs (see W. R. Woodward, 1978; Fisette, 2006, 2012; B. Centi, 2011) and the problem of the origins of space perception, which is in fact the central theme of Stumpf’s Raumbuch (Stumpf, 1873; M. Kaiser-El-Safti, 1994; D. Pradelle, 2015). In this book, dedicated to Lotze, Stumpf offers a summary of the debates between philosophers, scientists, and psychologists on the origins of space perception since Fechner. In the preface to this book, Stumpf explains that his starting point is the controversy between nativism and empiricism triggered by Helmholtz in his Handbuch (H. von Helmholtz, 1910, vol. 3, § 25) while his inspiration lies in Lotze (1852) Medizinischer Psychologie. Lotze’s influence on the young Stumpf’s thought is not limited to his doctrine of local signs as Stumpf repeatedly emphasized (R. Rollinger, 2008; N. Milkov, 2015; D. Fisette, 2009b). Beyond the question of influence, Stumpf assigns a central role to Lotze’s thought in the history of philosophy and associates him with a renaissance of philosophy in the mid-nineteenth century (Stumpf, 1907).