Polybius ends this great diapason of Greek thought. When the Philosophy of history appears next, as in Plutarch's tract on 'Why God's anger is delayed,' the pendulum of thought had swung back to where it began. His theory was introduced to the Romans under the cultured style of Cicero, and was welcomed by them as the philosophical panegyric of their state. The last notice of it in Latin literature is in the pages of Tacitus, who alludes to the stable polity formed out of these elements as a constitution easier to commend than to produce and in no case lasting. Yet Polybius had seen the future with no uncertain eye, and had prophesied the rise of the Empire from the unbalanced power of the ochlocracy fifty years and more before there was joy in the Julian household over the birth of that boy who, borne to power as the champion of the people, died wearing the purple of a king. No attitude of historical criticism is more important than the means by which the ancients attained to the philosophy of history. The principle of heredity can be exemplified in literature as well as in organic life: Aristotle, Plato and Polybius are the lineal ancestors of Fichte and Hegel, of Vico and Cousin, of Montesquieu and Tocqueville. As my aim is not to give an account of historians but to point out those great thinkers whose methods have furthered the advance of this spirit of historical criticism, I shall pass over those annalists and chroniclers who intervened between Thucydides and Polybius. Yet perhaps it may serve to throw new light on the real nature of this spirit and its intimate connection with all other forms of advanced thought if I give some estimate of the character and rise of those many influences prejudicial to the scientific study of history which cause such a wide gap between these two historians. Foremost among these is the growing influence of rhetoric and the Isocratean school, which seems to have regarded history as an arena for the display of either pathos or paradoxes, not a scientific investigation into laws. The new age is the age of style. The same spirit of exclusive attention to form which made Euripides often, like Swinburne, prefer music to meaning and melody to morality, which gave to the later Greek statues that refined effeminacy, that overstrained gracefulness of attitude, was felt in the sphere of history. The rules laid down for historical composition are those relating to the aesthetic value of digressions, the legality of employing more than one metaphor in the same sentence, and the like; and historians are ranked not by their power of estimating evidence but by the goodness of the Greek they write.