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In Posterior Analytics B1-10, Aristotle constructs theory of inquiry, which has two crucial theses: (a) “everything which is inquired is the inquiry into a middle term” and (b) “what it is and why it is are the same.” These are concerned with definition and demonstration. Then I will show how the relation between (a) and (b) is, while he seems to put them as mutually dependent conceptions in the relevant context. I distinguish B1-10 into three phases: phase 1; practice of inquiry (B1-2), phase 2; traditional framework (B3-7), phase 3; his theory of inquiry (B8-10).These three phases, I think, reflect on the relation between (a) and (b), and provide us backgrounds of the construction of the theory. Especially, phase 2 maintains the balance of definition and demonstration in the beginning of B8 on the basis of a traditional concept; essence.