This study explores the theoretical relationship between Aristotle s theory of syllogism and his conception of demonstrative knowledge. More specifically, I consider why Aristotle s theory of demonstration presupposes his theory of syllogism. In reconsidering the relationship between Aristotle s two Analytics, I modify this widely discussed question. The problem of the relationship between Aristotle s logic and his theory of proof is commonly approached from the standpoint of whether the theory of demonstration presupposes the theory of syllogism. By contrast, I assume the theoretical...