The reader is already sufficiently familiar with the general structure of the buildings which we have attempted to describe, and the present condition of their ruins. He will remember that there are walls there now standing, fifteen feet thick and more, built with an art and strength which defy both competition and decay; that there is one pyramid upwards of a hundred feet in height, with a building upon its summit, which supports trees that are planted in soil deposited from the atmosphere for the last thousand years or more. Let the reader compare these ruins, in their present condition, with the Cloaca Maxima of Rome. More than twenty-five hundred years have elapsed since this work was constructed, to drain off the waters of the Forum and the adjacent hollows to the Tiber, and there it stands to this day without a stone displaced, still performing its destined service. How many years before it will present the ruinous aspect of the “Temple” of Chi-Chen? Evidently the city of Chi-Chen was an antiquity when the foundations of the Parthenon at Athens, and the Cloaca Maxima at Rome, were being laid. Compare with the ruins of Central America the conspicuous remains of Balbeck, of Antioch, of Carthage—shall I not add, of Tadmor, of Thebes, of Memphis, and of Gizeh, their Pyramids, their Labyrinths, their Obelisks, and Sepulchres. Who shall say that while the servile workmen of Cheops or Cephrinus were sacrificing the lives of countless multitudes of men, to prove that the gods were not alone immortal, and to rear for themselves imperishable burial-places, that at the same time, on another continent, thousands of miles from the Egyptian house of bondage, a people of a different race, unknowing and unknown to history, were not laying the foundations of cities and of palaces and of temples, less stupendous perhaps, but no less a wonder and a mystery to succeeding nations? It is not for any man now to place a limit to the age of the American ruins; but one thing will be evident to every one who shall look at the more ancient of those in Yucatan, that they belong to the remotest antiquity. Their age is not to be measured by hundreds, but by thousands of years.