 The main development of modal syllogistic in Campsall’s work is his systematic application of the distinction between composite (de dicto) and divided (de re) modal sentences. Campsall seems to have held that the system of modal syllogisms presented in the Prior Analytics was intended for divided modal sentences, and so he tries to prove that what Aristotle said is basically correct when modal sentences are understood in this way. But this turns out to be a very cumbersome task. It is no surprise that he does not quite succeed, as he occasionally admits.