Originally published by the Center for Hellenic Studies, this book investigates the extent to which the Presocratics were hamstrung by their lack of detailed conceptual framework in the case of the words "one" and "many." This investigation is based on Aristotle's analyses. The book also delimits the place of these terms in the ancient evidence for the Eleatics, the Ionians, and Empedocles. It pays special attention to some recent interpretations of Parmenides and considers other major thinkers and scholars. Co-published with the Center for Hellenic Studies at Harvard University.