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Hon. Clarence King, Director:<br><br>Sir: In compliance with your instructions of March 6, 1880, directing me to report upon the Geology, Mineralogy, Chemistry, and Physics of the Comstock Lode, I have the honor to transmit the accompanying report.<br><br>Although several reports on the Comstock Lode have appeared during the past twenty years, the great extension of the mine workings and the advances in geological science made it probable that additional information of value would result from a reexamination of this famous ore-deposit. Administrative duties unfortunately prevented you from undertaking the study of the lower portions of the Lode, the upper part of which you have made so familiar to geologists. Under these circumstances, you did me the honor to select me as your substitute; yet you did not abandon all share in the investigation, since at every stage of it I have had the advantage of your cordial support and wise counsel.
George F. Becker
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