Note 39 — Chapter IV · DE INTERPRETATIONE.
Reading edition
Aristot. De Interpret. p. 21, a. 34-p. 22, a. 13. See the note of Waitz, ad Organ. I. p. 359, who points out the error of Aristotle, partly indicated by Ammonius in the Scholia.
The rule does not hold in propositions with the sign of universality attached to the subject; but it is at least the same for Modals and Non-modals.