With its signal distinction between 'intuition' and 'analysis' and its exploration of the different levels of Duration (Bergson's term for Heraclitean flux), An Introduction to Metaphysics has had a significant impact on subsequent twentieth century thought. The arts, from post-impressionist painting to the stream of consciousness novel, and philosophies as diverse as pragmatism, process philosophy, and existentialism bear its imprint. Consigned for a while to the margins of philosophy, Bergson's thought is making its way back to the mainstream. The reissue of this important work comes at an opportune time, and will be welcomed by teachers and scholars alike. --Peter A. Y. Gunter, University of North Texas