Arch of Overlapping Stones.
The highest walls still standing at the time of Simpson's visit had floor-timbers, or their marks, for four stories, but it is not impossible that some of the buildings may have had originally five or six stories. The outer walls were in every case perpendicular to their full height, showing that the houses were not built in receding terraces, or stories, on the outside, as is the case with many of the inhabited Pueblo towns, and with the Casa Grande on the Gila. There can be no doubt that they were so terraced on the interior or court; at least in no instance were the inner walls sufficiently high to indicate a different arrangement, and it is hardly possible that all the ranges were of the same height, leaving without light most of the thousand rooms which they would contain if built on such a plan. There were no traces of stairways or chimneys seen. The whole number of apartments in the Pueblo Bonito, supposing it to have been built on the terrace plan, must have been six hundred and forty-one. The cut on the next page shows a restoration of one of the Chaco ruins, taken from Mr Baldwin's work, and modeled after a similar one by Mr Kern, a companion of Simpson, although Mr Kern made an error of one story in the height. I have no doubt of the general accuracy of this restoration, and it may be regarded as nearly certain that access to the upper rooms was gained from the court by means of ladders, each story forming a platform before the doors of the one next above.
Each ruin has from one to seven circular structures, called estufas in the inhabited Pueblo towns, sunk in the ground and walled with stone. Several of these are shown in the two ground plans that have been given. They occur both in the courtyards and underneath the rooms. Some were divided into compartments, and one, in the Pueblo Bonito, was sixty feet in diameter and twelve feet deep, being built in two, and possibly three, stories.
Restoration of Pueblo Hungo Pavie.
Pottery—Chaco Cañon.