was already in the air and belongs to no one sophist or philosopher. This was the distinction between Nature on the one hand and Custom or Convention on the other. The historian Herodotus, who was no sophist but loved a good story, tells how the Persian king, Darius, called some Greeks and some Indian tribesmen together into his presence. He then asked the Greeks what payment would induce them to eat the dead bodies of their fathers. "Nothing in the world," they cried in indignation. "They would reverently burn them." He proceeded to ask the Indians what they would take to burn their fathers' bodies, and they repelled the bare thought with horror; they would do nothing but eat them with every mark of love and respect. "Fire burns in the same way both here and in Persia," the saying was, "but men's notions of right and wrong are not at all the same." The one is Nature; the other is man's Custom or Convention. This antithesis between "Phusis" and "Nomos" ran vividly through the whole of Greek philosophy, and awoke with renewed vigour in Rousseau and the radical writers of the eighteenth century. It is an antithesis against which conformist
