Two other large buildings, facing each other, are embellished with sculpture, the most remarkable features of which are two colossal serpents, which once extended the whole length of the walls. Further on are four great ranges of edifices, placed on the uppermost of three terraces. The plan of these buildings is quadrangular, with a courtyard in the centre. The walls are, like the others, ornamented with rich and intricate carving, presenting a scene of strange magnificence. One of the buildings is 170 feet long, and is remarkable for the two colossal entwined serpents which run round it, and encompass nearly all the ornaments throughout its whole length. These serpents are sculptured out of small blocks of stone, which are arranged in the wall with great skill and precision. One of the serpents has its monstrous jaws distended; and within them is a human head, the face of which is distinctly visible in the carving. The most tastefully ornamented edifice is know as the "House of the Dwarf." It stands on the summit of a lofty mound, faced with stone, nearly ninety feet high, the building itself being seventeen feet high. Its purpose it is difficult to divine. Scattered throughout the ruins are a number of dome-shaped subterraneous chambers, from eight to ten feet deep, and from twelve to twenty in diameter. The floor is of hard matter, and the walls and ceilings of plaster. A circular hole at the summit of each, barely large enough to admit a man, is the only opening into them. It is not known whether they were used as cisterns, or for granaries, like those of Egypt. OTHER RUINS. The whole country to the south of Uxmal is covered with ruins. At a place called Labra, there is a tower richly ornamented, forty feet in height, which stands on the summit of an artificial elevation. In another place there is one forty-five feet high; along the top of which, standing out from the wall, is a row of deaths' heads--or perhaps monkeys' heads--and underneath are two lines of human figures, greatly mutilated. At Kewick, a short distance from Labra, are numerous other ruins, mostly remarkable for the simplicity of their architecture and the grandeur of their proportions. It is still uncertain whether these cities were inhabited by the unhappy people conquered by the Spaniards, or whether they were built by a race which, from some unknown cause, had already passed away. We see how completely the Mexicans and Peruvians, after the conquest, sunk from their comparatively high state of civilisation into barbarism; and such might have been the case with the inhabitants of these cities. Their origin will probably for ever afford matter for speculation.