The section of the cliff which was examined embraced the northern series of these caves, extending from a promontory forming one side of a blind or box canyon to nearly opposite our camp. Adjacent to this series of rooms, but farther down the river, on the same side, there are two narrow side canyons, in both of which are also numerous caves, in all respects similar to the series we chose for examination. At several points on the summit of the cliffs, above the caves, large rectangular ruins, with fallen walls, were discovered; these ruins are, however, in no respect peculiar, but closely resemble those ordinarily found in a similar position throughout this region and elsewhere in Arizona and New Mexico. From their proximity to the caves it would seem that the cavate dwellings, and the pueblos on the summits of the mesas in which they are found, had been inhabited by one people; but better evidence that such is true is drawn from the character of the architecture and the nature of the art remains common to both. Let us first consider the series of caves from a point opposite our camp to the promontory which forms a pinnacle at the mouth of the first of the two side caverns--a row of caves the entrances to which are shown in the accompanying illustration (plate XCII). I have lettered these rooms, as indicated by their entrances, _a_ to _l_, beginning with the opening on the left. The rock in which these caves have been hewn is very soft, and almost white in color, save for a slightly reddish brown stratum just below the line of entrances to the cavate chambers. Although, as a general thing, the wall of the cliff is almost perpendicular, and the caves at points inaccessible, entrance to the majority of them can be effected by mounting the heaps of small stones forming the débris, which has fallen even to the bed of the river at various places, and by following a ledge which connects the line of entrances. The easiest approach mounts a steep decline, not far from the promontory at the lower level of the line, which conducts to a ledge running along in front of the caves about 150 feet above the bed of the stream. Roughly speaking, this ledge is about 100 feet below the summit of the cliff. It was impossible to reach several of the rooms, and it is probable that when the caves were inhabited access to any one of them was even more difficult than at present.