The positivist-historicist argument about the alleged or denied difference between the study of man and the study of nature began in Germany one century ago with Einleitung in die Geisteswissenschaften by W. Dilthey (1883) (discussion called by K.-O. Apel Erklären/Verstehen-Kontroverse).¹ It finds in Explanation and Understanding, published by G. H. [Von Wright 1971, its clearest contemporary formulation. An epistemological puzzle with strong metaphysical implications (like the distinction between mind and matter) becomes a problem that can be solved or at least clarified by common-language conceptual analysis.