 Descriptional sentences have a syllogistic logic like substantial sentences and Avicenna thinks part of Aristotle’s modal syllogistic can be worked out using descriptional sentences (for a comparison with similar logics found in the thirteenth-century Latin tradition, see Lagerlund 2009). But even though Avicenna sketches a syllogistic for descriptional sentences in Pointers and Reminders, he is mostly concerned with substantial sentences and their logic. 