Every advantage was taken, both natural and artificial, to conceal them from view. “Cedars and pines grew thickly along the ledges upon which they are built, hiding completely any thing behind them. All that we did find were built of the same materials as the cliffs themselves with but few, and then only the smallest, appertures toward the cañon, the surface being dressed very smooth, and showing no lines of masonry. It was only on the very closest inspection that the houses could be separated from the cliff.” View of Cliff in which the House is situated. To illustrate the singular position in which this house was located, we introduce this cut. It is seven hundred feet above the valley. “Whether viewed from below or from the heights above, the effect is almost startling, and one can not but feel that no ordinary circumstances could have driven a people to such places of resort.” As showing the difficulty an enemy would have to approach such a house, we give Mr. Jackson’s account of his climb to it: “The first five hundred feet of ascent were over a long, steep slope of _debris,_ overgrown with cedar, then came alternately perpendiculars and slopes. Immediately below the house was a nearly perpendicular ascent of one hundred feet, that puzzled us for a while, and which we were only able to surmount by finding cracks and crevices into which fingers and toes could be inserted. From the little ledges occasionally found, and by stepping upon each other’s shoulders, and grasping tufts of yucca, one would draw himself up to another shelf, and then, by letting down a stick of cedar or a hand, would assist the others.” “Soon we reached a slope, smooth and steep, in which there had been cut a series of steps, now weathered away into a series of undulating hummocks, by which it was easy to ascend, and without them almost an impossibility. Another short, steep slope, and we were under the ledge on which stood our house.” By referring to the first cut, we see that the house stands on a very narrow ledge, and that the rocks overhang it so as to furnish a roof. It will also be noticed that the ledge is rounding, so that the outer walls of the house rise from an incline. Piers, or abutments, had also been built along the ledge, so as to form an esplanade. Plan of the House.