 Cook Wilson also argued (OPD, §5) that Idea numbers form a series ordered by a relation of ‘before and after’ (πρότερον καὶ ὔστερον) and, following Aristotle’s testimony in Eth. Nic. I 6, 1096a17–19 and Met. B 3, 999a6–14, that there could be no genus of the species forming such ordered series (for a critique of this reading of Aristotle, see Lloyd (1962)). In other words, there can be no Form or universal of the Idea numbers. He would thus claim that in the proposition ‘The number Two is a universal’, the expression ‘a universal’ cannot denote in turn a particularization of ‘universalness’, because the latter is not a true universal as it lacks an “intrinsic character” (SI, 342 n.1 &amp; 351), and this he took to be the point of Plato’s doctrine of “unaddible numbers” (SI, 352).