his usual zeal and shill during the entire season, and 
much of the accuracy and value of the work is due to him, 
"During the sickness of a member of the party at the 
base of Sopris Peak, I was detained about twenty days. In 
the mean time, Messrs. Holmes and Chittenden made a careful 
geological and topographical study of the northwestern portion 
of the Elk Mountains, the results of which will be found 
embodied in Mr. Holmes 1 report. Great numbers of topograph¬ 
ical and geological sketches were made by Mr. Holmes, which 
will serve in a remarkably clear manner to illustrate the 
structure of the interesting regions surveyed." (Page 7) 
(Hayden’s letter to the Secretary) 
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"Report on the Geology of the 
Northwestern Portion of the Elk Range." 
(Pages 59-71) 
W. H. Holmes 
