 (2) For example, I shall beg off saying anything about (a) whether genera and species are real or are situated in bare thoughts alone, (b) whether as real they are bodies or incorporeals, and (c) whether they are separated or in sensibles and have their reality in connection with them. Such business is profound, and requires another, greater investigation. Instead I shall now try to show how the ancients, the Peripatetics among them most of all, interpreted genus and species and the other matters before us in a more logical fashion. [Porphyry, Isagoge, in Spade 1994 (henceforth, Five Texts), p. 1.]