Book excerpt: "We need a philosophy of both history and spirit to deal with the problems we touch upon here. Yet we would be unduly rigorous if we were to wait for perfectly elaborated principles before speaking philosophically of politics." Thus Merleau-Ponty introduces Adventures of the Dialectic, his study of Marxist philosophy and thought. In this study, containing chapters on Weber, Lukacs, Lenin, Sartre, and Marx himself, Merleau-Ponty investigates and attempts to go beyond the dialectic.