In the same State of Oaxaca are the famous ruins of Mitla, pride of the archæology of Mexico, situated some thirty miles from the state capital of Oaxaca. These famous ruins of Mitla are of a different character to the pyramidal structures of Monte Alban, although they have a low pyramidal base and were built mainly for religious purposes, it is probable, like most of these prehistoric monuments. They are situated in an inhabited valley, and the ruins consist of five main groups, some of which are exceedingly well preserved. Indeed, whilst the ruins of Mitla are by no means so extensive as others described, they are in the best state of preservation of any in the country. And this is due both to their method of construction and to their environment; for, unlike the low, tropical regions of Chiapas and Yucatan, this district is at a considerable altitude above sea-level. The great "palaces" or halls which these groups form, occupy an area of about 1,800 feet from north to south, by 1,200 feet from east to west. The principal groups are known as the "Hall of the Monoliths or Columns," the "Catholic group," and the "Arroyo group." Like some of the pyramids throughout Mexico, these are oriented, in this case the variation being but a few degrees from the cardinal points of the compass. The remarkable Hall of the Monoliths is a building some 125 feet long by 25 feet wide, with a row of great stone columns running down the centre. These columns are cut from a single piece of trachyte, 15 feet in height, and 3 feet in diameter at the base, tapering somewhat upwards, but of almost cylindrical form, without pedestal or capital. Whilst these columns are intact, the roof, which was doubtless supported on beams resting on the column, is gone. The weight of these monoliths is calculated at five or six tons, and they were cut from quarries in the trachyte rock of the mountains some five miles away, and more than 1,000 feet above the site of Mitla. In this quarry half-cut blocks for columns and lintels are still in place. Food for thought, even for the modern engineer, is this work.

PREHISTORIC MEXICO: RUINS OF MITLA; HALL OF THE MONOLITHS OR COLUMNS.

But the monolithic columns here are by no means the only remarkable features of the masonry of Mitla. The interior and exterior of these great halls are carved with a beautifully executed geometrical design—the Greek pattern enclosed in a quadrilateral, the blocks upon which they are cut being exactly fitted and adjusted in their places with scarcely visible joints. Indeed, at Mitla, as in other places in the Americas—Huanuco[9] and Cuzco, in Peru, for example—it seems to have been deemed an essential and peculiar art to adjust great blocks of stone with so great a nicety that no mortar was necessary and the joints almost invisible. This, of course, necessitated infinite time and patience—both of which were at the disposal of these prehistoric builders. It is to be recollected, in this connection, that each stone was generally an individual and not a counterpart, and so often had to be fitted to its fellows in the wall, by the laborious method of continually placing and removing. The remarkable and intricate nature of the mosaics and carved blocks at Mitla call forth the admiration of the observer. A vast number of separate stones have been employed, each requiring its respective forming, shaping, and placing, and one of the halls alone shows more than 13,000 such stones in its walls. The stone doorways to these halls are chaste, massive, and effective. The stone lintels in some cases are more than 12 feet long, and nearly 4 feet thick. Indeed, there exist at Mitla nearly a hundred examples of great monoliths, whether columns, lintels, or roof stones, some weighing as much as 15 tons, and up to 20 feet in length.

9 See the "Andes and the Amazon."

The earliest account of the ruins of Mitla, by Francisco de Burgoa, a priest of Oaxaca, who visited them in 1674, states that these beautiful halls were the scene, in prehistoric times, of the most diabolical rites. To-day the ruins are surrounded by a rude native population, most of whom dwell in wretched jacales, in a waterless and sun-beat valley—an environment in striking contrast to the antique splendour of these halls of the earlier occupiers of the land.

The ruins of Palenque, in the State of Chiapas, are situated at the base of the picturesque foothills of Tumbala, which border upon Guatemala, in a true tropical environment of luxuriant forest and brimming streams. From this setting the ruined temples and pyramids stand forth like a vision of a charmed or fabled story. Dense tropical undergrowth covers them, and grows again as soon as explorers, who have removed portions of Nature's persistent covering, leave the place. The main structures take the form of great truncated pyramids built up of earth, stones, and masonry, with temples and palaces of masonry upon their summits. Twelve of these pyramids have been discovered so far, and eight are crowned by buildings, the principal of which are known respectively as, the "Temple of the Sun," the "Temple of the Cross," "Temple of the Inscriptions," and the extensive group of ruins termed "The Palace." These temples and palaces consist of massive masonry walls, partly of roughly-shaped blocks, and partly of cut-and-carved stone, and stucco sculpture, with numerous doorways or openings on to the platform of the pyramid-summit. The interior of the buildings is a singular vault-like construction, covered with roofs of masonry carried by the vaulting. These vaults, however, do not embody the principle of the arch, but rather of the off-set, or lean-to, and are very high in proportion to their width. From the palace group arises a square tower of four storeys, about 40 feet in height, forming the centre of the group of extensive courts, buildings, and façades which surround it, all built upon the summit of a pyramid some 200 feet square. As in the Yucatan structures, the lintels over the doorway-openings in the walls were of wood, and their decay has largely been the cause of the façades having fallen into ruins, in many places. There are various interior staircases to these buildings, and the huge and unique reliefs of human figures are a remarkable feature of the interior. The beautiful figure known as the Beau Relief is compared to the relief sculptures of Babylon and Egypt. The material of construction was limestone, generally in unshaped blocks, not laid in regular courses, but with large quantities of mortar and stucco. The walls were lavishly painted and coloured. Indeed, the nature of the building has doubtless obeyed the character of the stone, which does not lend itself to careful cutting and carving like the easily-worked trachyte of Mitla. A very noteworthy structure of this prehistoric city, is the subterranean passage-way for the stream, which passes down the valley upon whose slopes the ruins of Palenque are situated. This, of stone-vaulted construction, after the manner before described, is somewhat less than 1,000 feet long, and the stream still flows through a portion of it. On every hand the extraordinary vigour of the tropical forest is evident, and the dense growth of trees, vines, and herbs which cover valley, pyramid, walls, and roofs, attest the power of the vegetable world.

The prehistoric structures of Yucatan—among the principal of which are those of Uxmal and Chichen-Ytza—are exceedingly numerous. Indeed, the traveller in this territory of the Mayas is rarely out of sight of crumbling pyramid or temple, as he traverses the dense forests of these curious flat and streamless limestone regions. Whilst most of these edifices were for purposes of religious ceremonial, the object of many of them can scarcely be conjectured. Their builders appear to have been people of a peaceful nature, and their dwellings do not generally bear evidence of defensive design. The architectural skill of the Mayas must have been of a very high order. Among the buildings which exist some are nearly perfect units of design, and seem almost to argue the use of "working drawings," as the plan and detail must have been perfected as a whole before the building was begun. This architectural skill of conception, however, has been common in many countries. Some of the buildings were in use when Cortes landed and fought on the shores of Yucatan, nearly four hundred years ago; nevertheless, they are in a remarkable state of preservation, notwithstanding the ravages both of Nature and of man, tending towards their destruction; for on the one hand, the roots of trees and profuse vegetation of a tropical region are efficient levers in the throwing down of the masonry, and on the other, the vandal ignorance of the surrounding inhabitants of the modern towns of the region permits them to make use of the stones in their own walls.

The ruins of Chichen-Ytza, the prehistoric city in the northern part of Yucatan, are among the most important and best preserved of any of the stone structures of the Americas. The ruins are grouped around two great natural wells, the cenotes, famous in this remarkable peninsula. Indeed, the derivation of the name of the old city is from Maya words meaning the "Mouth of the Well," and it serves to show the value in which these singular water-supplies were held in this riverless region of Yucatan. Among the most interesting of the structures of Chichen and Uxmal is that of the buildings known as El Foloc, or "the Church." Another is that known as the "House of the Nuns," and yet another the "Temple of the Tigers," which latter shows a sculptured procession of tigers or lynxes. Again, "the Castle" is remarkable, set upon a pyramid rising more than 100 feet above the plain. The "Governor's Palace," the "House of the Pigeons," and "House of the Turtles," are others of these remarkable structures.