Diseases of the chest and the principles of physical diagnosis . oniosis due to inorganic dust. The changes pro-duced in the lungs of the gold miners of South Africa and in those exposedto slag dust are worthy of special mention. According to Oliver, gold7ni7iers^ phthisis is especially rapid in its development. Gold miners onthe Rand can follow the employment but for a few years; as a rule fromfive to ten years. Besides being produced in a relativeh^ short time, thefibrosis is very extensive and gives rise to the most extreme disease is brought about by the inhalation of a very fi
Diseases of the chest and the principles of physical diagnosis . oniosis due to inorganic dust. The changes pro-duced in the lungs of the gold miners of South Africa and in those exposedto slag dust are worthy of special mention. According to Oliver, gold7ni7iers^ phthisis is especially rapid in its development. Gold miners onthe Rand can follow the employment but for a few years; as a rule fromfive to ten years. Besides being produced in a relativeh^ short time, thefibrosis is very extensive and gives rise to the most extreme disease is brought about by the inhalation of a very fine form of dustcomposed of sharp-pointed particles of silex. This dust is produced by DISEASES OF THE LUNGS 479 drilling the rock with machine drills. The tendency to respiratorydisorders is also increased by reason of the fact that the men are rapidlytransported from a warm, deep mine to the surface where the air is spite of the evidence of extensive pulmonary changes Oliver was struckby the fact that these men presented a healthy, bronzed Fig. 305.—Anthracosis. Although those exposed to slag dust frequently develop pulmonarydisease, the changes in the lungs are very different from that ordinarilyencounterea in pneumoconiosis. The slag dust gives rise to an acuteinflammation of the lower lobe of one of the lungs, which after death is 480 DISEASES OF THE BRONCHI, LUNGS, PLEURA, AND DIAPHRAGM found to be the seat of ordinary gra}^ hepatization. It is noteworthythat the inflammation of the lungs commences like pneumonia andruns a similar course, with rigor, pain in the chest, rusty sputa, and, in30 per cent, of the cases, herpes on the lips. On physical examinationsigns of pulmonary consolidation are to be noted (Oliver). Symptoms.—-Exposure to any form of dust, even for a brief periodof time, is apt to cause considerable irritation of the upper air passages,as manifested by cough and sometimes sneezing. Owing to the factthat coal dust is relatively the l
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