In this volume historically divergent conceptions of psychology as a science receive special emphasis. The volume illuminates the particular nature of studies of the psyche in the contexts of Aristotelian and Cartesian as well as 19th- and 20th-century science and philosophy. The relations between metaphysics, transcendental philosophy, and natural science are studied in the works of Kant, Brentano, Bergson, Husserl, Merleau-Ponty, Wittgenstein, and Davidson. Accounts of less known philosophers, such as Trendelenburg and Maine de Biran, throw new light on the history of the field. Discussions concerning the connections between moral philosophy and philosophical psychology broaden the volume’s perspective and show new directions for development.