I measured a room in another part of the quadrangle which had different dimensions, and was more in accordance with the earlier system of building. It was twenty-two feet long and ten feet five inches wide. The height of the perpendicular portion of the walls was eight feet three inches, and the length of the upper slope to the cap-stone was eight feet nine inches. The total height of the room about sixteen feet. The doorway was a little over seven feet high and the width was five feet eight inches. The dimensions of the chambers round the quadrangle varied, but the instances I have given represent their average sizes. There were two lintels over each doorway, for the width of each piece of timber was not sufficient to occupy the full depth of the wall. In the first-mentioned chamber they were each nine feet five inches long, one foot wide and eight inches deep, and had a bearing upon each wall of one foot five inches. In this and other openings the inner lintel rested in its place a little lower than the outer one. The object of this singular method of placing these supports was not apparent. The lintels were externally in perfect condition, and were without any signs of decay. The main mass of the Uxmal walls is composed of rubble limestones, made into a strong compact substance, by the plentiful use of good binding mortar. Each facing stone was made into a triangular shape, and the point or apex seems to have been pushed or fitted into its place, and there firmly secured by mortar. This method of applying the masonry was adopted not only with the plain smooth blocks of square stone used for facing the lower portions of the buildings, but also with all the sculptured portions of the walls. The blocks fit closely together in their places so accurately and with such careful finish that the joints or edges can scarcely be distinguished. It is thus made evident that the stone-masons who built Uxmal must have been men capable of performing their work with skill. The architect must have possessed a competent knowledge of the preparation of a plan or design, and the masons, in separately executing their part of the sculpture, must have been able to follow the design with an exactness that is almost mathematical.