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.