Note 85 — Chapter III · CATEGORIÆ.
Reading edition
Aristot. Categ. p. 4, a. 10: Μάλιστα δὲ ἴδιον τοῦτο τῆς οὐσίας δοκεῖ εἶναι, τὸ ταὐτὸν καὶ ἓν ἀριθμῷ ὂν τῶν ἐναντίων εἶναι δεκτικόν. See Waitz, note, p. 290: δεκτικὸν dicitur τὸ ἐν ᾧ πέφυκεν ὑπάρχειν τι.
Dexippus, and after him Simplikius, observe justly, that the characteristic mark of πρώτη οὐσία is this very circumstance of being unum numero, which belongs in common to all πρῶται οὐσίαι, and is indicated by the Proper name: λύσις δὲ τούτου, ὅτι αὐτὸ τὸ μίαν εἶναι ἀριθμῷ, κοινός ἐστι λόγος. (Simpl. in Categor., fol. 22 Δ.; Dexippus, book ii. sect. 18, p. 57, ed. Spengel.)