Note 35 — Chapter III · CATEGORIÆ.

Aristotle here, in the Categoriæ, ranks Genus and Species as being, both of them, δεύτεραι οὐσίαι. Yet since he admits Genus to be farther removed from πρώτη οὐσία than Species is, he ought rather to have called Genus a Third Essence. In the Metaphysica he recognizes a gradation or ordination of οὐσία into First, Second, and Third, founded upon a totally different principle: the Concrete, which in the Categoriæ ranks as πρώτη οὐσία, ranks as τρίτη οὐσία in the Metaphysica. See Metaphys. Η. p. 1043, a. 18-28.