that then, as now, there was a general community of culture, 
if not kinship in blood. 
Owing to differences in the composition of the rocky 
strata, t'ne natural shelters occupied by the cliff dwellers 
greatly in character. While many are mere horizontal 
A 
crevices or isolated niches, large enough only for men to 
crawl into and build minute stone lodges, there are extensive 
chambers, with comparatively level floors and roofs, opening 
outward in great sweeps of solid rock surface, more imposing 
than any structure built by human hands. These latter are 
capable of accommodating not merely single households, but 
communities of considerable size. The niches occur at all 
levels in cliffs rising to the height of nearly a thousand 
feet, and are often approached with great difficulty from be¬ 
low or, in rare cases, from above. mere the way is very 
steep, niche stairways v/ere cut in the rock face, making ap- 
