 Kilwardby also stresses that in a per se necessity sentence, the subject must be ‘something belonging in itself to that predicate’ (‘per se aliquod ipsius predicati’), by which he seems to mean that the subject has the predicate as an essential property, i.e., such that it has the predicate as a necessary property through itself and not through something else. A syllogistic necessity sentence is then understood as a proposition expressing the essential properties of a thing in a genus/species relationship. He seems to assume that in a per se necessity sentence, the subject term is not an accidental term but an essential or necessary term, and that the subject is essentially (per se) linked to the predicate rather than merely through the weaker relation of inseparability. Consequently, if the subject term is necessary and the link is necessary, it follows that the predicate term cannot be merely a contingent (accidental) term. It must be necessary as well. The Aristotelian theory of necessity syllogistic is thus limited to a special class of terms, all of which stand for substances. The same terminology is also used to explain syllogistic for contingency sentences, which suggests that Kilwardby was trying to develop a uniform and highly original interpretation of the theory. A number of recent scholars have offered similar interpretations of Aristotle (see van Rijen 1989, Patterson 1995, Thom 1996, and Nortmann 1996).