CHALICOSIS PULMONUM OR CHRONIC INTERSTITIAL PNEUMONIA INDUCED BY STONE DUST.

Abstract

The advent of the cyanid process of milling makes it possible to treat large bodies of low grade ore that previously could not be handled at a profit. This involved new methods of milling and taxed the ingenuity and inventive genius of the promoters. The transition has forced the expenditure of large sums of money and involved certain loss of human life by exaggerating old causes of danger. Many of these milling plants are springing up in the mining districts of the west, all involving more or less the same difficulties, but in order to make my investigations of a scientific value I must necessarily study the history of a single plant. I, therefore, desire to report the observations and experience of myself and friends among the workers of such a plant, also to call your attention to the greatly increased rate of mortality among the employees, induced by the