 What determines whether a term has material, simple or personal supposition? One view might be that it depends on the intention of the speaker; another, that all propositions are ambiguous. However, the prevailing medieval view was that it was determined by the predicate, so that, e.g., a predicate like ‘is a noun’ requires material supposition for the subject, while ‘is a species’ requires simple supposition: “A subject, on the other hand, sometimes supposits a form separately and sometimes does not, depending on what the predicate demands, in accordance with the following [principle]: Subjects are of such sorts as the predicates may have allowed” (Sherwood, tr. Kretzmann, p.  113).[22]  This slogan, talia subiecta qualia predicata permiserint (subjects are such as predicates permit), was commonly attributed to Boethius; but Sherwood correctly points out that Boethius' point was different, and his phrase was the converse: “talia [predicata] qualia subiecta permiserint” – see De Rijk, Logica Modernorum II (1), p. 561.