THREE:It has been mentioned that Carneades was the head of the Academic school. In that capacity, he was the lineal inheritor of Plato��s teaching. Yet a public apology for injustice, even when balanced by a previous panegyric on its opposite, might seem to be of all lessons the most alien from Platonism; and in a State governed by Plato��s own laws, it would certainly have been punishable with death. To explain this anomaly is to relate the history of Greek scepticism, which is what we shall now attempt to do.