the attainment of external and selfish ends, and of substituting mere technical proficiency for real science.’[77] If our account be the true one, this would apply to Gorgias and the younger rhetoricians alone. One does not precisely see what external or selfish ends were subserved by the physical philosophy which Prodicus and Hippias taught, nor why the comprehensive enquiries of Protagoras into the conditions of civilisation and the limits of human knowledge should be contemptuously flung aside because he made them the basis of an honourable profession. Zeller, in much the same strain, defines a Sophist as one who professes to be a teacher of wisdom, while his object is individual culture (die formelle und praktische Bildung des Subjekts) and not the scientific investigation of truth.[78] We do not know whether Grote was content with an explanation which would only have required an unimportant modification of his own statements to agree precisely with them. It ought amply to have satisfied Lewes. For ourselves, we must confess to caring very little whether the Sophists investigated truth for its own sake or as a means to self-culture. We believe, and in the next chapter we hope to show, that Socrates, at any rate, did not treat knowledge apart from practice as an end in itself. But the history of philosophy is not concerned with such subtleties as these. Our contention is that the Stoic, Epicurean, and Sceptical schools may be traced back through Antisthenes and Aristippus to Hippias and Protagoras much more directly than to Socrates. If Zeller will grant this, then he can no longer treat Sophisticism as a mere solvent of the old physical philosophy. If he denies it, we can only appeal to his own history, which here, as well as in our discussions of early Greek thought, we have found more useful than any other work on the subject. Our obligations to Grote are of a more general character. We have learned from him to look at the Sophists without prejudice. But we think that he, too, underrates their far-reaching intellectual significance, while his defence of their moral orthodoxy seems, so far as certain members of the class are concerned, inconsistent with any belief in Plato’s historical fidelity. That the most eminent Sophists did nothing to corrupt Greek morality is now almost universally admitted. If we have succeeded in showing that they did not corrupt but fruitfully develop Greek philosophy, the purpose of this study will have been sufficiently fulfilled.