For many years some knowledge of crystallography and mineralogy has been considered of basic value in the training of geologists, mining and civil engineers, foresters, chemists, pharmacists, and ceramists for their pursuits, of necessity, take them into the field, or involve the use of minerals as raw materials. Many of them also find the use of crystal-optical methods of great value in their analytical and general determinative work. Furthermore, physicists have recently begun to take a lively interest in these subjects, because of the startling results achieved by the application of X-rays to the study of crystal structure.

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