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In September, 1913, the writer paid a brief visit to the famous old silver camp of Aspen, in Pitkin County, southwestern Colorado, to obtain samples of the rich silver ores for microscopic study. Systematic studies of the distribution of the rich silver ores in the mines and of many other factors that have a bearing on their origin were not practicable in the time available, but some incidental observations on the depth of oxidation and downward enrichment and on the quality of mine waters are here recorded. Two analyses of mine waters were made by Chase Palmer, then with the United States Geological Survey. For more detailed accounts of the general geologic features of the district the reader is referred to the wellknown reports of J. E. Spurr.1 The writer's observations are offered as a brief contribution to the problem of the origin of the rich silver ores of Aspen, with full recognition of the desirability of amplifying them and of supporting them by other lines of field evidence. As the writer will be unable personally to undertake such studies the data are here placed at the disposal of other observers.

Contributions to economic geology (short papers and preliminary reports), 1923-1924, Part I, Metals and nonmetals except fuels. Observations on the rich silver ores of Aspen Colorado