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Show 36 below the passage- way. In two or three instauces, as shown in the plan, the front wall has given way, precipitating all but the back wall to the bottom of the cliffs. Holes have been drilled into the rock in a few places beneath the walls, evidently to assist in retaining them in their places. The whole front of this portion of the town is without an aperture, save very small windows, and is perfectly inaccessible, both from the solidity of the wall and the precipitous nature of the foundation- rock beneath it. Admittance was probably gained from near the circular building in the center, by ladders or any other well- guarded approach over the rocks. In Fig. 3 of the same plate we have a view of the other half of the town. From the estufa we have to climb np about 8 feet, reaching a narrow ledge that starts out from the bluff; from here to the farther end the buildings are built irregularly over the uneven surface of rocky d6br% 8y each house conforming to the irregularities by which it is surrounded, but all presenting the general arrangement of a cluster about; a central court, as at d and e, that served, in all pfobability, as corrals for their domestic animals. In some places near these corrals the under surface has broken away, disclosing a solidly- packed bed of old manure, very nearly resolved back iuto dust agaiu, and through which were scattered twigs of willow and sticks of cedar. Some of the rooms are quite large, from 15 to 25 feet in length; the very small rooms surrounding them were probably for storage, and in some cases seem to have answered the purpose of fire- places, as at / , for baking pottery, very likely. None of these buildings, as far as we could discover, were of more than one story in height. All the doorways or windows opened from within the courts or corrals, and were unusually large, reaching in some cases the whole height of the wall. The front line was so broken down that it was impossible to tell to what extent it was accessible, although we may reasonably infer that it was not so. with the exception, perhaps, of away for themselves and their animals. The bluff itselt was easy to asceud, being composed of large rocks filled up with smaller debris. In their construction these buildings differ from any we have yet met, in the thickness, or rather thinness, of their walls, being very seldom more than a foot, and more frequently between that and six inches thick. The stones of which they are built are in long thiu slabs, trimmed down roughly to the required size aud laid in an abundance of adobe mortar. In most of the rooms, both the inside aud outside have been smoothly plastered over with clay, and, where protected overhead, still retain that coating in fair preservation. A few rods to the right is another smaller recessed bench, upon which are built two small houses, each about ten feet square, aud one with its roof still entire. The approach from below is a smooth, rocky surface, so steep as to be almost impossible to asceud, with no remains of any other easier method of getting up. At the foot of the bluff beneath that portion of the ruin marked <?, in the ground- plan, a low bench rises about ten feet above the surrounding valley, upon which are indications of old buildings and of other remains- our so- called burial places. Chipped flint work was plentiful, as we found a number of very beautiful specimens of arrow- points, perforators, knives, aud some domestic utensils. In a mass of debris at the foot of the two- story tower, seven large eartheu pots of rough indented ware were found imbedded in the soil and filled with earth. They were too fragile to admit of transportation upon pack animals, so |