Chapter 28
Property and inseparable accident have this in common: that without them those things in which they inhere cannot exist, and that both are always present. Distinguishing peculiarities of property and accident are: that the property belongs to one species, whereas the accident belongs to several; that whereas the property is convertible with the species, the accident never is; and that, whereas the accident admits of more or less, the property by no means does.
{Κοινωνία καὶ διαφορὰ ἰδίου καὶ ἀχωρίστου συμβεβηκότος.} Κοινὰ ἰδίου καὶ συμβεβηκότος ἀχωρίστου τὸ μὴ ἄνευ αὐτῶν συστῆναι ἐκεῖνα, οἷς ὑπάρχουσι, καὶ ὅτι ἀμφότερα ἀεὶ πάρεισι. Διαφορὰ ἰδίου καὶ συμβεβηκότος: ὅτι τὸ μὲν ἴδιον ἑνὶ εἴδει ὑπάρχει, τὸ δὲ συμβεβηκὸς πλείοσιν: ὅτι τὸ μὲν ἴδιον ἀντιστρέφει πρὸς τὸ εἶδος, τὸ δὲ συμβεβηκὸς οὐκέτι: ὅτι τὸ μὲν συμβεβηκὸς ἐπιδέχεται τὸ μᾶλλον καὶ ἧττον, τὸ δὲ ἴδιον οὐδαμῶς.