Recent historiogra hy has demonstrated a growing sensitivity toward t eme by ocusin on Alexander von Humboldt and his understandin of nature as ,cosmos<. Hum oldt's cosmic concept stressed the interrelatedness o all natural phenomena and their historicity. Humboldt regarded both as dependent on specific spatial conditions. In his view, the same held true for the ideas about nature, the Weltanschauungen, that evolved in history. Against this background, >Humboldtian science< should not be reduced to a mere empiricist approach of interpreting systematically collected data. ,Humboldtian sciencec was fundamentally a concept that paid attention to the formulation of knowledge as well as to the effects and the esthetic impact of that knowledge in geographical and cultural s aces.Along these lines, this articles argues for adopting a Humbol B tian view in observing the spatial dimensions of history. Three ramifications of Humboldtian ideas into the culture of the nineteenth century serve as examples of how we mi ht ourselves em loy such a view: The transfer of Humboldtian ideas into t t e field cal exploration of the American West and its German-American community; and, finally, the reading of Humboldt in Germany's popular culture during the last third of the nineteenth century that generated a >>cosmic understanding<< of evolution different from Darwin's theory. In all cases, geographical and cultural spaces strengthened the receptiveness for ,Humboldtian science< not only to satisfy the need for knowledge; beyond that, Humboldt's ideas nourished an esthetic perception of nature, and they served as a vehicle for the ideological search for unity in nature and human society. Schliisselworter: Amerika, Humboldtian Science, kosmische Entwicklungslehre, Kosmos-Werk, Raum aIs historische Kategorie, WesterschIiei3ung Amerikas; Alexander von Humboldt, Ferdinand Miiller, Georg von Neumayer, George Engelmann, Emil Adolf Rossmassler; XIX Jh. s ace as a eographical and cu P tural category. The following article expands on this K f % B sciences o P Australia; the appeal of Humboldtian in the botanical and meteorologi-,Raume des Wissens' historisch zu erkunden, ja neu entdecken zu konnendieses Bemiihen setzt voraus, Raum als eine grundlegende historische Kategorie ernstzunehmen und sie in ihrer Vielschichtigkeit zu entschlusseln. Der Begriff Raum tragt indes fur eine Geschichte des Wissens ganz unterschiedliche Bedeutungen in sich. Er kann den konkreten, physischen Ort bezeichnen, an dem Wissen hervorgebracht und prasentiert worden ist; er mag das soziale Umfeld meinen, in dem Wis-':-Erweiterte Fassung des offentlichen Abendvortrages im Rahmen des XXXVI. Symposiums der Gesellschaft fur Wissenschaftsgeschichte, ,,Raume des Wissens", 13.-14.