LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey. 
Washington, I). C, November 4, 1899. 
Sir : I submit herewith a manuscript entitled Contributions to Chem- 
istry and Mineralogy from the Laboratory of the United States Geo- 
logical Survey. I have the honor to request that it be published as a 
bulletin of the Survey. 
Very respectfully, F. W. Clarke, 
Chief Chemist. 
Hon. Charles D. Walcott, 
Director United States Geological /Survey. 
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