Descartes' The World offers the most comprehensive vision of the nature of the world since Aristotle, and is crucial for an understanding of his later writings, in particular the Meditations and Principles of Philosophy. Above all, it provides an insight into how Descartes conceived of natural philosophy before he started to reformulate his doctrines in terms of a skeptically-driven epistemology. This volume offers a new translation of the work together with related writings that illuminate it, including the first English translation of the complete text of The Description of the Human Body.