LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey, 
Washington, D. C, May U, 190%. 
Sir: I have the honor to transmit herewith the manuscript of a 
report on the geology and water resources of the Snake River Plains 
of Idaho, by Israel C. Russell, with recommendation that it be pub- 
lished as a bulletin of the Survey. 
The field work on which the report is based was done under the 
supervision of the Division of Hydrography, and the paper was origi- 
nally intended as a water-supply paper. Mr. Newell has decided, how- 
ever, that the geological portions of the paper so far outweigh in 
importance and extent those relating strictly to hydrography that he 
recommends its publication as a bulletin rather than a water-supply 
paper. 
Very respectfully, 
C. W. Hayes, 
Geologist in Charge of Geology. 
Hon. Charles D. Walcott, 
Director United States Geological Survey. 
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