Jouni-Matti Kuukkanen

Wilfrid Sellars’s suggestion that there are valid material inferences entails that validity is not limited to formal inferences. Because material inferences are expressed in ordinary language and deal with both conceptual and empirical matters, an interesting prospect unfolds: valid reasoning is irreducibly plural. However, it is not clear what the validity of inferences composed of non-logical and descriptive vocabulary means. I argue that it is better to speak of the legitimacy rather than the validity of material inferences. A material inference can be understood as legitimate when one has a pragmatic propriety to infer from an assertion A to an assertion B. Pragmatic propriety designates the social-normative entitlement of inferencing. Because pragmatic proprieties are discipline-specific and local, legitimate reasoning is plural. Nevertheless, the shared general feature of reasoning practices is to preserve and improve the coherence of one’s system of belief.

Thomas Kuhn with his classic The Structure of Scientific Revolutions is one of the most influential and widely read philosophers of the 20th century. Kuhn's claim that the meanings of scientific terms change is often taken to be refuted by recent advances in the philosophy of language. Meaning Changes challenges this interpretation showing that meaning change in Kuhn has multiple aspects: Semantic, mental and historical. The author describes the traditional view with clarity, but demonstrates that Kuhn's idea stems from his studies of history. The book explains how Kuhn's philosophy is supported by cognitive science and why meaning change is relevant to the history of ideas. It argues that Kuhn's case against Hilary Putnam's causal theory of reference constitutes serious criticism of the account. The book concludes by analysing Kuhn's 'historical perspective' in the coherentist epistemological framework, which regards the question of scientific progress ultimately as empirical. This book will be of particular interest to students and scholars of the history and philosophy of science. It also is valuable reading to anybody interested in philosophy or scientific change.

Thomas Kuhn’s The Structure of Scientific Revolutions is a classic, and it is certainly not forgotten. However, an essential aspect about it has been neglected. That is, Kuhn’s Structure is a book in philosophy of history in the sense that Structure attempts gives an account of historical events, focuses on the whole of the history of science and stipulates a structure of the history of science to explain historical events. Kuhn’s book and its contribution to the debates about the progress of science and the contingency and inevitability of the history of science shows why and how philosophy of history is relevant for the history and philosophy of science. Its successful integration of historical and philosophical aspects in one account makes it worthwhile reading also for philosophers of history in the twentieth-first century. In particular, it raises the question whether the historical record can justify philosophical views and comprehensive syntheses of the past.