The walls are constructed of square, smooth blocks of stone, and on each side of the doorway are the remains of stone rings fixed in the walls with shafts, which no doubt had some connexion, with the support of the doors. The floors were of cement, in some places hard, but, by long exposure, broken, and now crumbling under the feet. The ceiling forms a triangular arch, as at Palenque, without the keystone. The support is made by stones overlapping, and bevilled so as to present a smooth surface, and within about a foot of the point of contact covered by a layer of flat stones. Across the arch were beams of wood, the ends built in the wall on each side, which had probably been used for the support of the arch while the building was in progress. For the rest, I refer to the plan, mentioning only one circumstance. In working out the plan on the spot, it was found that the back wall, throughout its whole length of two hundred and seventy feet, was nine feet thick, which was nearly equal to the width of the front apartment. Such thickness was not necessary for the support of the building, and, supposing it might contain some hidden passages, we determined to make a breach through the wall and to do this in the centre apartment. 1 must confess that I felt some repugnance to this work of demolition, but one stone had already been picked out by an Indian to serve for mashing maize upon; and as this was likely to be done at any time; when another might be wanted, I got over my scruples. Over the cavity left in the mortar by the removal of the stone were two conspicuous marks, which afterward stared us in the face in all the ruined buildings of the country. They were the prints of a red hand with the thumb and fingers extended, not drawn or painted, but stamped by the living hand, the pressure of the palm upon the stone. He who made it had stood before it alive as we did, and pressed his hand, moistened with red paint, hard against the stone. The seams and creases of the palm were clear and distinct in the impression. There was something lifelike about it that waked exciting thoughts, and almost presented the images of the departed inhabitants hovering about the building. And there was one striking feature about these hands; they were exceedingly small. Either of our own spread over and completely hid them; and this was interesting from the fact that we had ourselves remarked, and heard remarked by others, the smallness of the hands and feet as a striking feature in the physical conformation of the Indians at the present day.