The six studies comprising this volume deal with some fundamental issues in early Greek thought: cosmic evaluation in Anaximander, the theory of opposites from the Pre-Socratics to Plato and Aristotle, thought experimentation in Pre-Socratic thought, the origins of Greek Scepticism among the Sophisists, the prehistory of "Buridan's Ass" speculation, and the role of esthesis in Aristotle's theory of science. In each case the early discussion seeks to show how certain ideas bore unexpected fruit during the subsequent development of philosophical thought.