血と土
Another important figure in pre-Nazi "völkisch" thinking was Wilhelm Heinrich Riehl, whose work—"Land und Leute" ("Land and People", written between 1857 and 1863)—collectively tied the organic German Volk to its native landscape and nature, a pairing which stood in stark opposition to the mechanical and materialistic civilisation which was then developing as a result of industrialisation. Geographers Friedrich Ratzel and Karl Haushofer borrowed from Riehl's work as did Nazi ideologues Alfred Rosenberg and Paul Schultze-Naumburg, both of whom employed some of Riehl's philosophy in arguing that "each nation-state was an organism that required a particular living space in order to survive". Riehl's influence is overtly discernible in the "Blut und Boden" ("Blood and Soil") philosophy introduced by Oswald Spengler, which the Nazi agriculturalist Walther Darré and other prominent Nazis adopted.