From 1924 to 1933, the ISK (and its forerunner, the ISYL) maintained its rural school, the Walkemühle in the Adelshausen quarter of Melsungen, Hesse and from 1931 to 1933, its own newspaper, Der Funke, both of which were banned by the Nazis.
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Nelson moved his main published works there as well, his philosophical and political series Öffentliches Leben and his 1904 treatises, "Abhandlungen der Fries’schen Schule, Neue Folge", re-reasoned with mathematician Gerhard Hessenberg and physiologist Karl Kaiser, and which, after Nelson's death, was continued by Nobel Prize winner Otto Meyerhof, sociologist Franz Oppenheimer and Minna Specht until 1937.