Some call it folk psychology; others call it the perennial philosophy. According to Arthur Falk, author of Desire and Belief, 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 de re 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.