Illustrations 
XXXV 
PAGE 
The Grand Canyon.381 
Boats of the second Powell Expedition, showing armchair in which 
Powell sat. 
Photograph by J. K. Hillers, U. S. Colo. Riv. Exp. 
Filling’s Cascade.384 
Creeks of the High Plateaus. 
Photograph by J. K. Hillers, U. S. Geol. Survey. 
