The application of microscopic study, particularly of polished surfaces, to metallurgical problems was slow to develop but published data have accumulated rapidly in the last few years as shown by the bibliography. A great variety of information may be obtained as indicated by an outline under the headings of mineral, textural, quantitative, and special data. A review of problems encountered by the writer as well as several from the literature, serves to illustrate the value of the methods of microscopic analysis. Much more general application is desirable as lower grade ores are utilized.

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