This essay examines the role allocated to ostensive definition in the logical empiricist philosophy of the vienna circle. it explains how this characteristic array of doctrines grew out of reflections on the "tractatus". the various theses are distinguished into general principles, logical aspects, normative aspects and psychological theses. a detailed survey of wittgenstein's later analysis of ostensive definition is undertaken. this is then brought to bear on the doctrines of logical empiricism to show that they are incoherent. the essay concludes (...) by sketching out how much of those fallacious doctrines survive explicitly in contemporary philosophy of language. (shrink)

The physiologist and neo-Kantian philosopher Johannes von Kries (1853-1928) wrote one of the most philosophically important works on the foundation of probability after P.S. Laplace and before the First World War, his Principien der Wohrscheinlich-keitsrechnung (1886, repr. 1927). In this book, von Kries developed a highly original interpretation of probability, which maintains it to be both logical and objectively physical. After presenting his approach I shall pursue the influence it had on Ludwig Wittgenstein and Friedrich Waismann. It seems that von (...) Kries's approach had more potential than recognized in his time and that putting Waismann's and Wittgenstein's early work in a von Kries perspective is able to shed light on the notion of an elementary proposition. (shrink)

Parts of the book date back to and some of the concluding remarks on ethics and the will may have been composed still earlier, when Wittgenstein admired ...