Key points are not available for this paper at this time.
In previous reports rheumatic complaints in miners and non-mining members of the same popu- lation have been compared. Miners lost more work- ing time from rheumatic complaints and had more frequent and severe changes both of degeneration of the intervertebral discs and of osteo-arthritis of the knees and other joints (Lawrence and Aitken-
J. S. Lawrence (1955) studied this question.