240 
was very steep and in some places rather dangerous. In some 
places we had to lead our horses. The scenery was very in- 
teresting but the flora was poor. The woody vegetation con- 
sisted mostly of cedars (Juniperus monosperma), pinyons, moun- 
tain-mahogany, service-berries, scrub-oaks, etc. e cliffs on 
both sides were very steep; many had alcoves and caves formed 
in them; others were of most phantastic forms. The most re- 
markable in form were the so called Ostrich Rock and the 
Fic. 33. “El Archo”’ or ‘‘Pickyabo,"’ bridge in Pritchett Valley. 
Block Bridge, but the most interesting part of the scenery was 
the natural bridges. An illustration of El Archo or Pickayabo is 
given (fig. 33). The bridge is 62 feet high and the arch 49 feet 
high and 120 feet long. It is probably formed from a cave, in 
which a hole was first formed in the roof and then enlarged more 
and more by the action of the water, until at last a bridge was 
formed. Hall’s bridge, discovered by our guide, is of about the 
