On Aristotle's "On Coming-to-Be and Perishing 2.2–5"This important commentary by Alexander of Aphrodisias on Aristotle's work on biochemistry was previously lost. However, four chapters of it have been reidentified in an Arabic translation by Emma Gannage and are here translated for the first time. The chapters were preserved in the writings of an eighth century alchemist, Jabir ibn Hayyan. In addition to preserving an interesting example of very early cross cultural scientific activity in the Muslim