              Aristotle’s hylomorphism was formulated originally to handle various puzzles about change.   Among the endoxa confronting Aristotle in his Physics are some striking challenges to the coherence of the very notion of change, owing to  Parmenides  and  Zeno.  Aristotle’s initial impulse in the face of such challenges, as we have seen, is to preserve the appearances (phainomena), to explain how change is possible. Key to Aristotle’s response to the challenges bequeathed him is his insistence that all change involves at least two factors: something persisting and something gained or lost. Thus, when Socrates goes to the beach and comes away sun-tanned, something continues to exist, namely Socrates, even while something is lost, his pallor, and something else gained, his tan. This is a change in the category of quality, whence the common locution ‘qualitative change’. If he gains weight, then again something remains, Socrates, and something is gained, in this case a quantity of matter. Accordingly, in this instance we have not a qualitative but a quantitative change. 