This volume presents the investigation of nature in the Peripatos as a continuous effort to revise and expand on the comprehensive study of the physical world inaugurated by Aristotle. Each essay examines a specific problem, theme or member of the school, bringing to the fore how Aristotle's Hellenistic and post-Hellenistic heirs renewed his scientific project. Aristotle's theory of perception is elaborated on, new arguments are put forward for the eternity of the world, providence is incorporated into the Aristotelian universe. Peripatetic physics emerges from the combination of these and other perspectives on the study of nature from Theophrastus to Alexander.