In a lengthy new concluding chapter labeled "A Reply to Critics," Lon L. Fuller extends and clarifies his definition of the relation between law and morality put forward in the first (1964) edition of The Morality of Law. His original argument distinguishes between the morality of duty and the morality of aspiration, both of which bear on the design and operation of social institutions: the former by setting the necessary preconditions of any purposive social endeavor, the latter by suggesting the directions for such endeavor. In the revised edition, Fuller takes accurate aim at the...