Note 23 — THE MORAL AND INTELLECTUAL DIVERSITY OF RACES.

Even the historians of ancient Greece wondered at those gigantic ruins, of which many are still extant. Of these cyclopean remains, as they were often called, no one knew the builders or the history, and they were considered as the labors of the fabulous heroes of a traditional epoch. For an account of these memorials of an ante-hellenic civilization in Greece, of which we have no record, particularly the ruins of Orchomonos, Tirgus, Mycene, and the tunnels of Lake Copais, see Niebuhr's Ancient History, vol. i. p. 241, et passim. [23]