The analogy with thought hardly emphasises the independence of substance! Nevertheless, created substances do constitute the created world, and do, in that sense, meet criterion (i) for being substance. They are also the subjects of predication, so they meet criterion (iii). Leibniz’s substances, however, are the bearers of change (criterion (iv)) in a very different way from Aristotle’s individual substances. An Aristotelian individual possesses some properties essentially and some accidentally