Philosophers, psychiatrists, and social scientists would welcome clarification of the distinction between rational and irrational desires. It may be proper to say that rational desires are those which manifest rationality (or which at least do not conflict with its manifestations). But since this seems a rather unilluminating characterization, philosophers sometimes offer definitions of what constitute such manifestations of rationality. I shall consider definitions provided by John Rawls and Richard Brandt. Their definitions are unsatisfactory mainly because they include subjunctive conditionals. An alternative approach, which avoids conditionals, is attractive. But it encounters so many additional problems that I shall conclude that we are not now in a position to define rationality in this area and must treat it as a state or disposition which to date has only been partially characterized. Thus, if we want a definition of the difference between rational and irrational desires, we must at present settle for the rather unexciting one mentioned above.

Richard Rorty's eliminative materialism is an attack on dualism that has frequently been misrepresented and incorrectly criticized. By taking account of the mistakes that philosophers have made concerning eliminative materialism, a proper definition of the doctrine and a clarification of its relation to traditional materialism will emerge, as well as an understanding of its true strengths and weaknesses. The discussion centers around the original manner in which Rorty defended eliminative materialism by means of analogies to the elimination of talk about demons and talk about macroscopic physical objects.

In order to assess the tenacity of psychoanalysts in continuing to use a concept of psychic energy, it is advisable to consider whether, as they sometimes claim, the concepts of energy, force, and work in psychoanalysis are akin to those in the natural sciences. Strong disanalogies suggest that the psychoanalytic concepts are quite different and used equivocally even within psychoanalysis. However, they may not be subject to the objections which certain critical psychoanalysts have raised.