CHAPTER IV. THE ANTHROPOLOGICAL PERIOD: THE PHILOSOPHY OF

MAN, 55 AN HISTORICAL SUMMARY OF THE ANTHROPOLOGICAL PERIOD, 55 THE PERSIAN WARS AND THE RISE OF ATHENS, 56 THE GREEK ENLIGHTENMENT, 58 1. The Impulse for Learning, 58 2. The Practical Need of Knowledge, 59 3. The Critical Attitude of Mind, 61 THE SIGNIFICANCE OF THE SOPHISTS, 64 THE PROMINENT SOPHISTS, 67 THE PHILOSOPHY OF THE SOPHISTS, 68 1. The Relativism of Protagoras, 69 2. The Nihilism of Gorgias, 70 THE ETHICS OF THE SOPHISTS.――THE APPLICATION OF THEIR CRITICAL THEORY TO POLITICAL LIFE, 71 SUMMARY, 73