I argue that Wittgenstein’s short-lived verificationism (c.1929-30) differed from that of his contacts in the Vienna Circle in not being a reductionist view. It lay the groundwork for his later views that the meaning of a word is determined by its use and that certain "propositions of the form of empirical propositions" (On Certainty, §§96, 401, 402) act as "norm[s] of description" (On Certainty,§§167, 321). He gave it up once he realized that it contradicted his rejection of logical atomism, and (...) that he ever held such a view at all says something about his respect for the leader of the Vienna Circle, Moritz Schlick. (shrink)

The paper gives an overview of key themes of twentieth century philosophical treatment of the language of science, with special emphasis on the meaning variance of scientific terms and the comparison of alternative theories. These themes are dealt with via discussion of the topics of: (a) the logical positivist principle of verifiability and the problem of the meaning of theoretical terms, (b) the postpositivist thesis of semantic incommensurability, and (c) the scientific realist response to incommensurability based on the causal theory (...) of reference. (shrink)

That some propositions are testable, while others are not, was a fundamental idea in the philosophical program known as logical empiricism. That program is now widely thought to be defunct. Quine’s (1953) “Two Dogmas of Empiricism” and Hempel’s (1950) “Problems and Changes in the Empiricist Criterion of Meaning” are among its most notable epitaphs. Yet, as we know from Mark Twain’s comment on an obituary that he once had the pleasure of reading about himself, the report of a death can (...) be an exaggeration. The research program that began in Vienna and Berlin continues, even though many of the specific formulations that came out of those circles are flawed and need to be replaced. (shrink)