Geology and Mineralogy. 65 
demand. A scheme of colors for geologic charts and of conven- 
tional characters for diagrams is presented with illustrations, and 
the report concludes with a financial statement for the fiscal year 
ending June 30th, 1881. 
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several mining districts and some of the more important mining 
properties, and some observations on the relations of the ore 
The latter will undoubtedly be one of the most valuable contribu- 
Am. Jour. 5 eens Serres, Vor. XXVII, No. 157.—Jan., 1884. 
