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SMITHSONIAN MISCELLANEOUS COLLECTIONS \OL. 76 



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Fig. 76. — The expedition's pack train crossing the sandstone ridges that 

 reach out from the base of Navaho Mountain, en route to the Rainbow- 

 Natural Bridge. ( Photograph by E. L. Wisherd. Courtesy of the National 

 Geographic Society.) 



Fig. ~-/. — The Rainbow Natural Bridge, one of the most majestic and 

 inspiring spectacles in the United States, rises to a height of 309 feet yet 

 it is dwarfed by the sheer red walls of the canyon which shelters it. (Photo- 

 graph by E. L. Wisherd. Courtesy of the National Geographic Society.) 



