other disciplines from across the country and abroad. But these meetings differ markedly from others: too large to be dominated by any single clique or doctrine, they are at the same time small enough to encourage lively discussion within its organized sessions and not just in the corridors outside. The Society derives its focus from the two closely allied philosophical "directions" indicated in its title. Yet from the beginning it has included in its meetings a sizeable number of contributors who are not identified with or even sympathetic to these directions, but are at least willing to engage in a dialogue with those who are. Furthermore, the Society has accomplished to a limited degree something rare indeed in American intellectual life: an interdisciplinary ex- 2 INTRODUCTION change.