384 
The Colorado River 
all, and realising this, he gave freely to his collaborators. The 
work which he inspired and to which he contributed the most 
important creative elements, I believe to be at least as im¬ 
portant as that for which his name stands directly responsible. ’ ’ ^ 
Pilling’s Cascade. 
Creeks of the High Plateaus. 
Photograph by J. K. Hillers. U. S. Geol. Surv. 
In the field of geology he was particularly facile in the in¬ 
vention of apt descriptive terms, and indeed he was never at a 
loss for words to express new meanings, coining them readily 
* Science^ Oct. 10, ig02. 
