 Potential wholes are curious items. They are particulars, not universals. Yet potential wholes are not composed out of their parts in the way that, for example, a house is composed out of bricks and wood. Indeed, the most commonly discussed kind of potential whole is a soul. But for Aristotelians souls are forms and forms are mereologically simple. Thus, souls ought to be mereologically simple. That Boethius, or for that matter, Aristotle asserts that souls have parts is therefore initially quite puzzling. (For a list of the places where Aristotle talks about the parts of the soul as well as a defense of the claim that we should take Aristotle’s use of the term “parts” seriously, see Johansen 2014.)