Christian Pfeiffer explores an important, but neglected topic in Aristotle's theoretical philosophy: the theory of bodies. A body is a three-dimensionally extended and continuous magnitude bounded by surfaces. This notion is distinct from the notion of a perceptible or physical substance. Substances have bodies, that is to say, they are extended, their parts are continuous with each other and they have boundaries, which demarcate them from their surroundings. Pfeiffer argues that body, thus understood, has a pivotal role in Aristotle's natural (...) philosophy. A theory of body is a presupposed in, e.g., Aristotle's account of the infinite, place, or action and passion, because their being bodies explains why things have a location or how they can act upon each other. The notion of body can be ranked among the central concepts for natural science which are discussed in Physics III-IV. (shrink)

It is commonly held that Theophrastus criticized or rejected Aristotle's account of place. The evidence that scholars put forward for this view, from Simplicius' commentary on Aristotle's Physics, comes in two parts: (1) Simplicius reports some aporiai that Theophrastus found for Aristotle's account; (2) Simplicius cites a passage of Theophrastus which is said to 'bear witness' to the theory of place which Simplicius himself adopts (that of his teacher Damascius) — a theory which is utterly different from Aristotle's. But the (...) aporiai have relatively straightforward solutions, and we have no reason to suppose that Theophrastus didn't avail himself of them (and some reason to think that he did). Moreover, the text which Simplicius cites as bearing witness to Damascius' view on closer inspection does not seem to be inconsistent with Aristotle's account of place or natural motion. (shrink)

Journal Name: Apeiron Issue: Ahead of print.