The walls of the principal room and of the rooms immediately in front of it are constructed of stone; all the other walls in the upper ruin are of adobe or have adobe in them. The two rooms on the east and two walls of the room adjoining on the west are wholly of adobe, about 7 inches thick and now 3 and 4 feet high. In the southeast corner of the second room from the east there is an opening through the front wall which may have been a drain. It is on the floor level, round, 5 inches in diameter, and smoothly plastered. In the fourth room from the east there is a similar hole. Both of these discharge on the edge of the cliff, and it is difficult to imagine their purpose unless they were expedients for draining the rooms; but this would imply that the rooms were not roofed. Although the cliff above is probably 500 feet high, and overhangs to the degree that a rock pushed over its edge falls 15 feet or more outside of the outermost wall remains, and over 70 feet from the foot of the cliff, still a driving storm of rain or snow would leave considerable quantities of water in the front rooms if they were not roofed, and some means would have to be provided to carry it off. In the same room, the fourth from the east, there are the remains of a chimney-like structure, the only one in the upper ruin. It is in the northeast corner, at a point where the wall has fallen and been replaced by a Navaho burial cist also fallen in ruin, and was constructed of stone. There is no doubt that it was added some time after the walls were built, as it has cracked off from the wall on the east, which shows at that point its original finish. In the eastern wall of this room there is a well-finished opening, and at the corresponding point in the wall of the room on the right, the third wall from the east, there is another. The latter wall is of adobe, or rather there are two adobe walls built side by side; one, the eastern, considerably thinner than the other. The opening extends through both walls; it was neatly finished and was closed by a thin slab of stone plastered in with mud. It has the appliance for closing mentioned above and described later (page 165). Most of the openings in the walls appear to have been closed up at the time the houses were abandoned.