Comments on the clinical manifestations of silicosis as reported in this paper are based on a study1 carried out among 7,722 men employed as miners in the Picher District of Oklahoma. This work was done during the year 1928 by officers of the United States Bureau of Mines and the United States Public Health Service, in cooperation with the Metropolitan Life Insurance Company and the mine operators' association. In commenting on the similarity of these observations to those noted by Dr. Irvine and his associates in their study of the silicosis problem in South Africa, it will be recalled that Irvine2 summarized, in his report to the international conference held in Johannesburg in 1930, the results of the important work done by that group of investigators.
The disease has been divided, both in South Africa and in the United States, into two classes: simple silicosis and silicosis plus
SAYERS RR. THE CLINICAL MANIFESTATIONS OF SILICOSIS. JAMA. 1933;101(8):580–583. doi:10.1001/jama.1933.02740330012004
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