LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey, 
Coal-Testing Plant, World's Fair Grounds, 
St. Louis, Mo., January 31, 1905. 
Sir: The undersigned, appointed by you as a committee to conduct a 
series of tests at the United States Geological Survey coal-testing plant 
on the World's Fair Grounds, St. Louis, Mo., have the honor to submit 
the following preliminary report on the operations of the plant. The 
brief statements give the results obtained from September 1, 1904, 
when the plant was put in operation, until December 22, 1904. 
The detailed report, which will be fully illustrated and contain much 
additional information and a discussion of the results, is in prepara- 
tion and will be submitted to you at the earliest possible date. 
Very respectfully, E. W. Parker, 
J. A. Holmes, 
M. R. Campbell, 
Committee. 
Hon. Charles D. Walcott, 
Director United States Geological Survey. 
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