To supplement a study of some sulfide minerals by Dr. W. H. Newhouse of the Department of Geology of the Massachusetts Institute of Technology, the complete qualitative analysis of sixteen samples was undertaken by means of the emission spectra. The spectroscopic method of analysis was adopted to detect in the samples important traces (0.01% to 0.001%) of elements, particularly chromium, tungsten, vanadium, and molybdenum, that were suspected but whose determination by other means would have been laborious and uncertain. The results of the analysis demonstrate the value of a spectroscope having high dispersion in the analysis of minerals.

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