I examine Thomas Kuhn’s work regarding the role played by the concept of practice in the development of his theory of scientific rationality. I outline the epistemological implications of his theory of incommensurability. I then show how the original intuition of a practice-based and social conception of incommensurability is replaced by a more conventional linguistic interpretation. I then examine Kuhn’s solution to the problem of incommensurability and explain its inadequacy. I then show that, ultimately, his failure to grasp the epistemological (...) dimension of practice prevents him from providing a fully satisfactory solution to the epistemological problem raised in The Structure of Scientific Revolutions. (shrink)

This paper investigates the historical origins of the notion of incommensurability in contemporary philosophy of science. The aim is not to establish claims of priority, but to enhance our understanding of the notion by illuminating the various issues that contributed to its development. Kuhn developed his notion of incommensurability primarily under the influence of Fleck, Polanyi, and Köhler. Feyerabend, who had developed his notion more than a decade earlier, drew directly from Duhem, who had developed a notion of incommensurability in (...) 1906. The idea is that in the course of scientific advance, when fundamental theories change, meanings change, which can result in a new conception of the nature of reality. Feyerabend repeatedly used this notion of incommensurability to attack various forms of conceptual conservativism. These include the logical positivists’ foundational use of protocol statements, Heisenberg’s methodological principle that established results must be presupposed by all further research, attempts to separate philosophical accounts of ontology from physics, Bohr’s principle of complementarity, and logical empiricist accounts of reduction and explanation. Focusing on the function of the notion of incommensurability common to Feyerabend’s various critiques explicates Feyerabend’s early philosophy as a series of challenges to forms of conceptual conservativism.Keywords: Incommensurability ; Paul Feyerabend; Thomas Kuhn; Pierre Duhem; Wolfgang Köhler; Ludwik Fleck. (shrink)

Born in 1918 in New York, awarded a doctorate in analytical chemistry (1944), Leonard K. Nash enjoyed a distinguished career at Harvard, holding a chair of chemistry from 1959 to 1986. Conducting research in thermodynamics and statistical mechanics, Nash authored successful textbooks, some of which remain in print (e.g. Elements of Chemical Thermodynamics, and Elements of Statistical Thermodynamics).This essay describes the theory of science that Nash developed in a book he published in 1963, The Nature of the Natural Sciences. The (...) present author is of the view that Nash's neglected theory is worth retrieving, as one that is likely to kindle the interest of historians of metascience on several counts. Part of .. (shrink)