This is the third volume of Hilary Putnam's philosophical papers, published in paperback for the first time. The volume contains his major essays from 1975 to 1982, which reveal a large shift in emphasis in the 'realist' position developed in his earlier work. While not renouncing those views, Professor Putnam has continued to explore their epistemological consequences and conceptual history. He now, crucially, sees theories of truth and of meaning that derive from a firm notion of reference as inadequate.

Hilary Putnam deals in this book with some of the most fundamental persistent problems in philosophy: the nature of truth, knowledge and rationality. His aim is to break down the fixed categories of thought which have always appeared to define and constrain the permissible solutions to these problems.

One of America's great philosophers says the time has come to reform philosophy. Putnam calls upon philosophers to attend to the gap between the present condition of their subject and the human aspirations that philosophy should and once did claim to represent. His goal is to embed philosophy in social life.

The author, one of the first philosophers to advance the notion that the computer is an apt model for the mind, takes a radical view of his own theory of functionalism in this book.

"The first two lectures place the alternative I defend -- a kind of pragmatic realism -- in a historical and metaphysical context. Part of that context is provided by Husserl's remark that the history of modern philosophy begins with Galileo -- that is, modern philosophy has been hypnotized by the idea that scientific facts are all the facts there are. Another part is provided by the analysis of a very simple example of what I call 'contextual relativity'. The position I defend holds that truth depends on conceptual scheme and it is nonetheless 'real truth'. "In my third lecture I turn to the Kantian antecedents of this view, explaining what I think should be retained of the Kantian idea of autonomy as the central theme of morality, and extracting from Kant's work a 'moral image of the world' that connects the ideals of equality and intellectual liberty. In this lecture I defend the idea that moral images are an indispensible part of our moral and cultural heritage. "In the final lecture I defend the idea of moral objectivity. I compare our epistemological positions in ethics, history, analysis of human character, and science, and I argue that in no area can we hope for a 'foundation' which is more ultimate than the beliefs that actually, at a given time, function as foundational in the area, the beliefs concerning which one has to say 'this is where my spade is turned'. In ethics such beliefs are represented in moral images of the world."

Putnam offers a sweeping account of the sources of several central problems of philosophy. A unifying theme of the volume is that reductionism, scientism, and old-style disenchanted naturalism tend to be obstacles to philosophical progress.

This study examines Hilary Putnam's work in epistemology, philosophy of science and mathematics, philosophical logic and semantics and cognitive psychology. It takes account of his various shifts in philosophical viewpoint over the past four decades, and demonstrates how Putnam arrived at the different positions he has occupied during his career, and discusses the various forms of anti-realist doctrine with which he has engaged. The workd offers commentary on Putnam's writing about conceptual problems in the interpretation of quantum mechanics and places Putnam's work in a wider philosophical context, relating it to various contemporary debates in epistemology and the philosophy of science.