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Ever since Kant published his Critique of Pure Reason, most philosophers have taken the distinction between science and philosophy to depend upon the existence of a class of truths specially amenable to philosophical investigation. In recent times, Quine's arguments against the analytic- synthetic distinction have cast doubt over the existence of such a class of special philosophical truths and consequently many now doubt that there is a sharp distinction between science and philosophy. In this paper, I present a perfectly sharp distinction between science and philosophy which does not depend upon any distinction between philosophical and scientific truths.

Tensions in Two Dogmas of Empiricism are not resolved in Quine's later writings. The role of simplicity remains mysterious. Naturalized epistemology is wrongly presented as the only alternative to phenomenalism, and no attempt is made to answer the objection that judgements of the rationality of human activities have no place within a naturalistic philosophy. The attempt to develop an empiricism without experience leads to an implausible behaviorism and to an unsuccessful naturalistic account of observation sentences.

The aim of this paper is twofold: First, to generalize Quine’s epistemology, to show that what Quine refutes for traditional epistemology is not only Cartesian foundationalism and Carnapian reductionism, but also any epistemological program if it takes atomic verificationist semantics or supernaturalism, which are rooted in the linguistic/factual distinction of individual sentences, as its underlying system. Thus, we will see that the range of naturalization in the Quinean sense is not as narrow as his critics think. Second, to normalize Quine’s epistemology, to explain in what sense Quinean naturalized epistemology is normative. The reason I maintain that critics miss the point of Quinean naturalized epistemology is that they do not appreciate the close connection between Quine’s naturalistic approach and his holistic approach to epistemology. To show this I shall reconstruct Quine’s argument for naturalizing epistemology within his systematic philosophy, and focus specifically on his holism and its applications, on which Quine relies both in arguing against traditional epistemology, and in supporting his theses of underdetermination of physical theory and indeterminacy of translation. This is the key to understanding the scope and the normativity of Quine’s epistemology. In the conclusion I will point out what the genuine problems are for Quinean naturalized epistemology.

On What Makes an Epistemology Naturalistic. Since the publication of W. V. Quine's classic paper "Epistemology Naturalized" there have been many discussion on the virtues and vices of naturalistic epistemology. Within these discussions not much attention has been paid to a basic question: What makes an epistemology naturalistic? I give an answer by providing a logical geography of competing naturalistic positions. Then I defend naturalistic epistemology against the charge of the so-called causal fallacy. Finally I give a critical appraisal of different naturalistic theories of knowledge and introduce cooperative naturalism as the most promising research strategy.

According to the standard story (a) W. V. Quine’s criticisms of the idea that logic is true by convention are directed against, and completely undermine, Rudolf Carnap’s idea that the logical truths of a language L are the sentences of L that are true-in- L solely in virtue of the linguistic conventions for L , and (b) Quine himself had no interest in or use for any notion of truth by convention. This paper argues that (a) and (b) are both false. Carnap did not endorse any truth-by-convention theses that are undermined by Quine’s technical observations. Quine knew this. Quine’s criticisms of the thesis that logic is true by convention are not directed against a truth-by-convention thesis that Carnap actually held, but are part of Quine’s own project of articulating the consequences of his scientific naturalism. Quine found that logic is not true by convention in any naturalistically acceptable sense. But he also observed that in set theory and other highly abstract parts of science we sometimes deliberately adopt postulates with no justification other than that they are elegant and convenient. For Quine such postulations constitute a naturalistically acceptable and fallible sort of truth by convention. It is only when an act of adopting a postulate is not indispensible to natural science that Quine sees it as affording truth by convention ‘unalloyed’. A naturalist who accepts Quine’s notion of truth by convention is therefore not limited (as naturalists are often thought to be) to accepting only those postulates that she regards as indispensible to natural science.

Roger Gibson has achieved as much as anyone else, indeed, more, in presenting and defending Quine’s philosophy. It is no surprise that the great man W.V. Quine himself said that in reading Gibson he gained a welcome perspective on his own work. His twin books The Philosophy of W.V. Quine and Enlightened Empiricism have no rivals. We are all indebted to Roger. The essay that follows is intended not only to honor him but also to continue a theme that runs throughout his (and Quine’s) work, namely, the seamless division between science and philosophy. The techniques we invoke are consonant with the naturalistic conception of language that central themes of Professor Gibson’s writings, namely, that language is “a social art to be studied empirically” (Enlightened Empiricism, p. 64).

In this article, I analyze Quine?s conception of science, which is a radical defence of extensionalism on the grounds that first?order logic is the most adequate logic for science. I examine some criticisms addressed to it, which show the role of modalities and probabilities in science and argue that Quine?s treatment of probability minimizes the intensional character of scientific language and methods by considering that probability is extensionalizable. But this extensionalizing leads to untenable results in some cases and is not consistent with the fact that Quine himself admits confirmation which includes probability. Quine?s extensionalism does not account for this fact and then seems unrealistic, even if science ought to be extensional in so far as it is descriptive and mathematically expressible.

1. Naturalism Naturalism, it has been said, is the distinctive development in philosophy over the last thirty years. There has been a naturalistic turn away from the a priori methods of traditional philosophy to a conception of philosophy as continuous with natural science. The doctrine has been extensively discussed and has won considerable following in the USA. This is, on the whole, not true of Britain and continental Europe, where the pragmatist tradition never took root, and the temptations of scientism in philosophy were less alluring. Contemporary American naturalism originates in the writings of Quine, the metaphysician of twentieth-century science. With extraordinary panache, he painted a largescale picture of human nature, of language and of the web of belief. I believe that in almost every major respect, it is, like the picture painted by Descartes, the great metaphysician of seventeenth-century science, mistaken. But it evidently appeals to the spirit of the times. So it is worthy of critical examination and careful refutation. I shall argue that the naturalistic turn is a cul-de-sac – a turn that is to be passed by if we are to keep to the highroad of good sense. Naturalism, like so many of Quine’s doctrines, was propounded in response to Carnap. As Quine understood matters, Carnap had been persuaded by Russell’s Our Knowledge of the External World that it is the task of philosophy to demonstrate that our knowledge of the external world is a logical construction out of, and hence can be reduced to, elementary experiences. Quine rejected the reductionism of Carnap’s Logischer Aufbau, and found the idealist basis uncongenial to his own dogmatic realist behaviourism, inspired by Watson and later reinforced by Skinner. The rejection of reductionism and ‘unregenerate realism’, Quine averred, were the sources of his naturalism (FME 72). What exactly was this? We can distinguish in Quine between three different but inter-related programmes for future philosophy: epistemological, ontological and philosophical naturalism. Naturalized epistemology is to displace traditional epistemology, transforming the investigation into ‘an enterprise within natural science’ (NNK 68) – a psychological enterprise of investigating how the ‘input’ of radiation, etc., impinging on the nerve endings of human beings can ‘ultimately’ result in an ‘output’ of our theoretical descriptions of the external world..

W. V. Quine was the most important naturalistic philosopher of the twentieth century and a major impetus for the recent resurgence of the view that empirical science is our best avenue to knowledge. His views, however, have not been well understood. Critics charge that Quine’s naturalized epistemology is circular and that it cannot be normative. Yet, such criticisms stem from a cluster of fundamental traditional assumptions regarding language, theory, and the knowing subject – the very presuppositions that Quine is at pains to reject. Through investigation of Quine’s views regarding language, knowledge, and reality, the author offers a new interpretation of Quine’s naturalism. The naturalism/antinaturalism debate can be advanced only by acknowledging and critiquing the substantial theoretical commitments implicit in the traditional view. Gregory argues that the responses to the circularity and non-normativity objections do just that. His analysis further reveals that Quine’s departure from the tradition penetrates the conception of the knowing subject, and he thus offers a new and engaging defence of Quine’s naturalism.

This paper defends and extends Quine's version of a naturalistic epistemology, and defends it against criticism, especially that offered by Kim, according to which Quine's naturalism deprives epistemology of its normative role, and indeed of its relevance to psychological states, such as beliefs, whose warrant epistemology aims to assess. I defend Quinean epistemology's objections to the epistemic pluralism associated with other self-styled naturalistic epistemologies, and show how recent theories in the philosophy of psychology which fail to account for the intentionality of psychological states in fact provide a cognitive foundation for an eliminativist epistemology which both honors Quine's strictures and helps us accommodate important findings and results in experimental psychology and cognitive science.