Some call it folk psychology; others call it the perennial philosophy. According to Arthur Falk, author of <I>Desire and Belief</I>, it's the traditional account of the mind's features that make it unique in nature. This work examines the nature of what philosophers call <I>de re</I> mental attitudes, paying close attention to the controversies over the nature of these and allied mental states. Over the course of the book, a story emerges within the traditional account that ultimately appeals to Darwinian principles. The book concludes with two chapters on the contemporary project of naturalizing the mind.