Aristotle's Eudemian Ethics was until recently treated as a poor cousin of the better-known Nicomachean Ethics - poor enough even to have to borrow its three central books (IV-VI) from the latter. The work has now emerged from its relative obscurity; many scholars, indeed, now claim - on the basis of what appear to be sound statistical arguments - that it is the Nicomachean Ethics that has to borrow its Books V-VII from the Eudemian. This critical...