"They don't have syntax, so we can eat them." According to Richard Sorabji, this conclusion attributed to the Stoic philosophers was based on Aristotle's argument that animals lack reason. In his fascinating, deeply learned book, Sorabji traces the roots of our thinking about animals back to Aristotelian and Stoic beliefs. Charting a recurrent theme in ancient philosophy of mind, he shows that today's controversies about animal rights represent...