SMITHSONIAN INSTITUTION 
UNITED STATES NATIONAL MUSEUM 
S. P. LANGLEY 
SECRETARY, SMITHSONIAN INSTITUTION 
WASHINGTON, d. c., September 21, 1398. 
Dear Sir: 
In compliance with the suggestion contained 
In your letter of September 19, I am pleased to autho- 
ize your absence from the Museum for a period of six 
weeks, or somewhat longer if in your judgment required, 
for the purpose of conducting explorations in the far 
West under the direct auspices of the Smithsonian Institu 
tion. It is understood that the National Museum will not 
be called upon to defray any expenses in connection with 
your explorations. 
Yours respectfully, 
Assistant Secretary 
Mr. ¥. H. Holmes, 
Head Curator, Department of Anthropology 
U. S. National Museum. 
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