This essay examines the provenance of a single, curious term that William James often used in connection with his own pragmatism. The term is Denkmittel, an uncommon German contraction of Denk (thought) and Mittel (instrument). James’s Central European sources for this now forgotten bit of philosophical jargon provide a small illustration of a bigger historical point that too often gets obscured. Pragmatism—James’s pragmatism, at least—was both allied with and inspired by a broader sweep of scientific instrumentalism that was already flourishing in fin de siècle European philosophy.
