One of the first to use "Blut und Boden", or "blood and soil" was Oswald Spengler in his book "Der Untergang des Abendlandes". In the book, Spengler talks about the "struggle of blood and soil about the inner form of a relocated species of animal and man". Walther Darré took the phrase and established the link. In his book "Neuadel aus Blut und Boden" (New nobility from blood and soil) he tries to show the relation between economic and agrarian policies, as well as racial ones.