The western end of the ledge was occupied by a structure whose use at first sight is not apparent. The wall, as shown on the plan, is curved, very thick and heavy, and built partly over the sloping rock forming the back of the cave. The front wall is 3 feet thick, and its top, now level, is about 5 feet above a narrow bench in front of it. There is no doorway or other opening into it, and access into its interior was had over the steep sloping rock to the north by means of hand-holes in the rock. These are shown in plate L. The interior appears to have been plastered. This structure measures 15 by 5 feet inside, there being no wall on the north, as the east wall merges into the sloping rock. The foot-holes in the rock, before referred to, are at this end, nearest the village, and appear to be in several series. The structure is so situated that the sun shines on it only a few hours each day, and it seems more than probable that it was a reservoir. The bed of the stream, the channel followed in low water, sweeps against the base of the cliff below this point, and by carrying water 20 feet it would be directly beneath and about 50 feet below it. Finally, the cliff wall above this point is decorated with pictographs of tadpoles and other water symbols in common use among the pueblos, and these do not occur elsewhere on this site. In the southwestern corner of the structure, near the bottom, there was an opening about 18 inches high, which was carefully filled up from the inside and plastered. This may have been an outlet by which the water was discharged when the reservoir was cleaned out. The wall has caved in slightly above it. The mud mortar used in building this structure and the other walls was necessarily brought from below. [Illustration: Plate L Reservoir in Ruin No. 10 ] About 25 feet east of the reservoir there are remains of a small single room, rectangular, with a circular addition, shown on the ground plan. The walls are well chinked and well constructed, the mud mortar being used when about the consistency of modeling clay. In front of this room, about 5 feet distant and on the edge of the sloping rock, a hole has been pecked into the solid rock of the ledge. This hole is 12 inches wide on top, slightly tapering, 10 inches deep on the upper side, and 4 inches on the lower. Twelve feet to the northeast there is a similar hole, and below it, distant 10 inches, another, and beyond this others, distributed generally along the foot of the sloping rock forming the back of the ledge, but sometimes farther out on the flat floor. Probably these holes mark the sites of upright posts supporting a drying scaffold or frame, the horizontal poles of which extended backward to the wall of the cliff. [Illustration: Fig. 25--Oven-like structure in ruin No. 10.]