38 
The Colorado River 
burned into his soul as here, where his ingenuity and power 
count for naught, 
Cardenas, after all, was only one of the discoverers. He was 
merely the first white man who saw it. When was it that the 
first man recoiled from the edge of that then actually unknown 
The Work of Erosion. 
The Witch of Endor and Cerberus. 
Photograph by J. K. Hillers, U. S. Geol. Survey. 
masterpiece of the Water-gods, who so persistently plied their 
tools in the forgotten ages? He was the real discoverer and he 
will never be known. As applied to new countries—new to 
our race—the term “unknown” is relative. Each fresh ex¬ 
plorer considers his the deed that shall permanently be re- 
