Eudemus of Rhodes was a pupil of Aristotle in the second half of the fourth century BCE. When Aristotle died, having chosen Theophrastus as his successor, Eudemus returned to Rhodes where it appears he founded his own school. His contributions to logic were significant: he took issue with Aristotle concerning the status of the existential is, and together with Theophrastus he made important contributions to hypothetical syllogistic and modal logic. He wrote at length on physics, largely following Aristotle, and took an interest in animal behavior. His histories on geometry,