The concept of the atom is very near scientific bedrock, touching first causes, fundamental principles, our conception of the nature of reality. This book is a translation from the French of a history of atomic thought and theory, from ancient Greece to the present day. Pullman grounds his coverage of scientific theory always in the religious and philosophical context of the times, covering the whole period of Western civilization, including in passing the major scientific philosophies of the Muslim world and India. The transition of atomism from a philosophical position to an experimental science, in the mid-19th century, is well handled, and the coverage is nicely rounded out by a treatment of the first visual proof of atoms' material existence by direct microscopic imaging of individual atoms, about ten years ago.