Sean Morris

This chapter will explore the evolution of Russell’s views on sense data from the mid-1890s to the mid-1910s. This will be set within the more general context of psychological discussions that took place in _Mind_ during and leading up to this period of Russel’s thought. A particular focus throughout will be Russell’s various characterizations of sense data (along with sensibilia, that is, unsensed sense data), from as early as 1897 to his 1912 _Problems of Philosophy_ and 1914 _Our Knowledge of the External World_ and ‘The Relation of Sense-Data to Physics’. I will argue that Russell’s changing views on the nature of sense data are largely in response to the changing nature of psychological research in this period. As psychology increasingly became an empirical science, distinct from philosophy, Russell alters his views so as to bring his account into line with current psychological work. Only in doing this can Russell bring his philosophy of the external world into line with our current best scientific theories and thus, establish a fully scientific philosophy.

This chapter examines the development of and motives for Quine’s particular form of mathematical structuralism. It will argue that Quine, unlike many contemporary mathematical structuralists, does not appeal to structuralism as a way of accounting for what the numbers _really_ are in any robust metaphysical sense. Instead, his structuralism is deeply rooted in an earlier structuralist tradition found in scientific philosophers such as Russell and Carnap, which emphasized structuralism as a critique of more metaphysical approaches to philosophy. On this view, a philosophy of mathematics answers, in a sense, only to mathematics itself. An account of mathematical objects requires only that the entities—whatever they are—serving as the mathematical objects satisfy the relevant postulates and theorems. Here we also see how Quine’s early work in the foundations of mathematics leads in a natural way to the more general naturalism of his later philosophy.

Rudolf Carnap and W. V. O Quine have long been seen as key figures of analytic philosophy who are opposed to each other, due in no small part to their famed debate over the analytic/synthetic distinction. This volume of new essays assembles for the first time a number of scholars of the history of analytic philosophy who see Carnap and Quine as figures largely sympathetic to each other in their philosophical views. The essays acknowledge the differences which exist, but through their emphasis on Carnap and Quine's shared assumption about how philosophy should be done-that philosophy should be complementary to and continuous with the natural and mathematical sciences-our understanding of how they diverge is also deepened. This volume reshapes our understanding not only of Carnap and Quine, but of the history of analytic philosophy generally.

In his “Epistemology Naturalized,” Quine embraces a form of Humeanism. In this paper, I try to work out the significance of this Humeanism. In particular, I argue that it represents an anti-metaphysical position that Quine shares with Carnap. Crucial to my account is that contrary to much contemporary thinking on metaphysics, Carnap, and Quine following him, recognize both an ontological and an epistemological sense of metaphysics. As commentators have frequently acknowledged, Carnap and Quine disagree over rejecting metaphysics in the ontological sense. I will argue, though, that they agree in rejecting metaphysics in their shared epistemological sense of the term.

Verhaegh’s excellent book provides the first complete account of Quine’s naturalism. Guiding Quine’s view is the idea that we cannot stand outside our theory of the world. We are always working from within. Only by understanding this idea do we see what Quine’s naturalism comes to.While many philosophers casually treat Quine’s naturalism as something already well-understood, Verhaegh does not, and he dedicates part 1 to its systematic exposition. According to him, this consists of two components: “the principled rejection of transcendental perspectives and the adoption of a perspective immanent to our scientific conceptual scheme,” both based on Quine’s view that we must always be working from within. Verhaegh...

Rudolf Carnap is well known for his attack on metaphysics, and W. V. Quine is equally well known for his attack on Carnap’s analytic/synthetic distinction. Receiving far less attention is their basic agreement that a properly scientific approach to philosophy should eliminate the metaphysical excesses of the past. This paper aims to remedy this. It focuses initially on the development of Carnap’s rejection of metaphysics from 1932 to 1950 and the role that analyticity plays. It then turns to Quine, emphasizing his basic agreement with Carnap over the elimination of metaphysics and what this looks like without the analytic/synthetic distinction.

In his “Wissenschaftslogik: The Role of Logic in the Philosophy of Science,” Michael Friedman argues that Carnap’s philosophy of science “is fundamentally anti-metaphysical—he aims to use the tools of mathematical logic to dissolve rather [than] solve traditional philosophical problems—and it is precisely this point that is missed by his logically-minded contemporaries such as Hempel and Quine”. In this paper, I take issue with this claim, arguing that Quine, too, is a part of this anti-metaphysical tradition. I begin in section I with Russell’s account of scientific philosophy, focusing on its critique of metaphysics and its reliance on logical constructions. I then argue that each of Carnap and Quine take up this call to scientific philosophizing but that they both find Russell’s account of logic wanting. In section II, I first provide an account of Carnap’s critique of metaphysics and its reliance on developments in logic. This is followed by a discussion of his appeal to the analytic/synthetic distinction so as to improve upon Russell’s account of logic. Section III follows this same structure but focuses on Quine. In the end, though, Quine turns not to the analytic/synthetic distinction but to holism to provide an account of logic suitable to scientific philosophy. Carnap had claimed to be “more Russellian than Russell,” and in this final move by Quine I argue that he is “being more Carnapian than Carnap.” I conclude by showing how, contrary to Friedman’s view, Quine’s rejection of the analytic/synthetic distinction does not yield a return to the kind metaphysics that he, Carnap, and Russell all objected to.

Quine's set theory, New Foundations, has often been treated as an anomaly in the history and philosophy of set theory. In this book, Sean Morris shows that it is in fact well-motivated, emerging in a natural way from the early development of set theory. Morris introduces and explores the notion of set theory as explication: the view that there is no single correct axiomatization of set theory, but rather that the various axiomatizations all serve to explicate the notion of set and are judged largely according to pragmatic criteria. Morris also brings out the important interplay between New Foundations, Quine's philosophy of set theory, and his philosophy more generally. We see that his early technical work in logic foreshadows his later famed naturalism, with his philosophy of set theory playing a crucial role in his primary philosophical project of clarifying our conceptual scheme and specifically its logical and mathematical components.

The aim of this thesis is to examine the debate between Quine and Boolos over the logical status of higher-order logic-with Quine taking the position that higher-logic is more properly understood as set theory and Boolos arguing in opposition that higher-order logic is of a genuinely logical character. My purpose here then will be to stay as neutral as possible over the question of whether or not higher-order logic counts as logic and to instead focus on the exposition of the debate itself as exemplified in the work of Quine and Boolos. Chapter I will be a detailed consideration of Quine's conception of logic and its place within the wider context of his philosophy. Only once this backdrop is in place will I then examine his views on higher-order logic. In Chapter II, I turn to Boolos's response to Quine-his attempt to examine the extent to which we may want to count higher-order logic as logic and the extent to which we may want to count it as set theory. With each point Boolos raises, I attempt to give what I think would have been Quine's reply. Finally, in Chapter III, I consider Boolos's attempt to show that monadic second-order logic should be understood as pure logic as it does not commit us to the existence of classes, as we may take the standard interpretation of MSOL to do. I discuss here some of the major reactions to Boolos's plural interpretation, and conclude with more speculative remarks on what Quine's own response might have been. Throughout this thesis, my primary method has been one of close textual analysis.

Many commentators now view Quine's ‘Truth by Convention’ as a flawed criticism of Carnap. Gary Ebbs argued recently that Quine never intended Carnap as his target. Quine's criticisms were part of his attempt to work out his own scientific naturalism. I agree that Carnap was not Quine's target but object that Quine's criticisms were wholly internal to his own philosophy. Instead, I argue that C.I. Lewis held the kind of truth‐by‐convention thesis that Quine rejects. This, however, leaves Carnap out of the picture. I then show how Quine came to see the earlier criticisms as also having force against Carnap.

Most commentators have overlooked the impact of Russell on Quine, focusing instead on the influence of Carnap. In what follows, I will argue that the early Quine’s engagement with Russell’s logicism was a crucial stage in the development of his philosophy. More specifically, we can see Quine’s naturalism as developing out of a certain strand of Russell’s thought concerning scientific philosophy. In addition to giving us a better sense of the origins of Quine’s philosophy, this reading also shows how his early work, focusing mostly on technical areas of logic, is deeply related to his later and more famous philosophical views. In particular, his reworking of Principia Mathematica can be understood as the technical working-out of his view that the purpose of philosophy is the clarification our conceptual scheme.