Until the launch of this series over fifteen years ago, the 15,000 volumes of the ancient Greek commentators on Aristotle, written mainly between 200 and 600 AD, constituted the largest corpus of extant Greek philosophical writings not translated into English or other European languages. In this, the first half of Philoponus' analysis of book one of Aristotle's Physics, the principal themes are metaphysical. Aristotle's opening chapter in...