Immanuel Kant’s claim that the categorical imperative of morality is based in practical reason has long been a source of puzzlement and doubt, even for sympathetic interpreters. Kant’s own explanations, which mainly concern his often-criticized formula of universal law, are laconic and obscure, leading interpreters to dismiss them in favor of less ambitious claims involving his other famous formulas.

In The Form of Practical Knowledge, Stephen Engstrom provides an illuminating new interpretation of the categorical imperative, arguing that we have exaggerated and misconceived Kant’s break with tradition: Kant never departs from the classical conception of practical reason as a capacity for knowledge of the good. His distinctive contribution is the idea that morality’s imperatives express the form of such knowledge.

By developing an account of practical knowledge that situates Kant’s ethics within his broader epistemology and rethinks numerous topics in his moral psychology and in his account of practical reason (including desire, intention, choice, will, as well as pleasure, happiness, and the good), Engstrom’s work promises to deepen and to reshape our understanding of Kantian ethics.

For many philosophers, modern philosophy begins in 1879 with the publication of Gottlob Frege's Begriffsschrift, in which Frege presents the first truly modern logic in his symbolic language, Begriffsschrift, or concept-script. Danielle Macbeth's book, the first full-length study of this language, offers a highly original new reading of Frege's logic based directly on Frege's own two-dimensional notation and his various writings about logic.

Setting out to explain the nature of Frege's logical notation, Macbeth brings clarity not only to Frege's symbolism and its motivation, but also to many other topics central to his philosophy. She develops a uniquely compelling account of Frege's Sinn/Bedeutung distinction, a distinction central to an adequate logical language; and she articulates a novel understanding of concepts, both of what they are and of how their contents are expressed in properly logical language. In her reading, Frege's Begriffsschrift emerges as a powerful and deeply illuminating alternative to the quantificational logic it would later inspire.

The most enlightening examination to date of the developments of Frege's thinking about his logic, this book introduces a new kind of logical language, one that promises surprising insight into a range of issues in metaphysics and epistemology, as well as in the philosophy of logic.

The American philosopher Wilfrid Sellars ranks as one of the leading twentieth-century critics of empiricism—a philosophical approach to knowledge that seeks to ground it in human sense experience. Sellars stood in the forefront of a recoil within analytic philosophy from the foundationalist assumptions of contemporary empiricists. From Empiricism to Expressivism is a far-reaching reinterpretation of Sellars from one of the philosopher’s most brilliant intellectual heirs.

Unifying and extending Sellars’s most important ideas, Robert Brandom constructs a theory of pragmatic expressivism which, in contrast to empiricism, understands meaning and knowledge in terms of the role expressions play in social practices. The key lies in Sellars’s radical reworking of Kant’s idea of the categories: the idea that the expressive job characteristic of many of the most important philosophical concepts is not to describe or explain the empirical world but rather to make explicit essential features of the conceptual framework that makes description and explanation possible.

Brandom reconciles otherwise disparate elements of Sellars’s system, revealing a greater level of coherence and consistency in the philosopher’s arguments against empiricism than has usually been acknowledged. From Empiricism to Expressivism clarifies what Sellars had in mind when he talked about moving analytic philosophy from its Humean to its Kantian phase, and why such a move might be of crucial importance today.

W. V. Quine is one of the most eminent philosophers alive today. Now in his mid-eighties he has produced a sharp, sprightly book that encapsulates the whole of his philosophical enterprise, including his thinking on all the key components of his epistemological stance--especially the value of logic and mathematics. New readers of Quine may have to go slowly, fathoming for themselves the richness that past readers already know lies between these elegant lines. For the faithful there is much to ponder.

In this short book, based on lectures delivered in Spain in 1990, Quine begins by locating his work historically. He provides a lightning tour of the history of philosophy (particularly the history of epistemology), beginning with Plato and culminating in an appreciative sketch of Carnap's philosophical ambitions and achievements. This leads, in the second chapter, to an introduction to Quine's attempt to naturalize epistemology, which emphasizes his continuities with Carnap rather than the differences between them. The next chapters develop the naturalistic story of the development of science to take account of how our conceptual apparatus is enhanced so that we can view the world as containing re-identifiable objects. Having explained the role of observation sentences in providing a checkpoint for assessing scientific theories, and having despaired of constructing an empirical criterion to determine which sentences are meaningful, Quine in the remaining chapters takes up a variety of important issues about knowledge. He concludes with an extended treatment of his views about reference and meaning and his attitudes toward psychological and modal notions.

The presentation is distinctive, and the many small refinements of detail and formulation will fascinate all who know Quine's philosophy.