^ Further explorations have since been made under the 
direction of the United States Geological Survey while Major 
Powell was its director, and as a result Captain Clarence E. 
Dutton has published one of the most interesting monographs 
ever penned by a specialist* Its title is "The Tertiary History 
fy 
of the Grand Canyon District,” and it is accompanied with a 
large atlas containing admirable pictures, etc., of the Canyon 
region, - from sketches made by Mr. W. H, Holmes, the accomplish- 
ed field geologist, artist, archaeologist, and writer, now in 
charge of the Anthropological Department of the Unites States 
National Museum. No praise^ 7 bestowed upon these gentlemen, 
for the fidelity with which they have described this marvellous 
rock region, can ever be adequate return for the pleasure they 
have afforded those who have enjoyed the fruit of their labors.)) 
(”In and Around the Grand Canyon? by George V/harton James, p35 ) 1 1 
