The following cases of pneumonoconiosis are presented because of their early development after comparatively short exposure, their paucity of clinical and roentgenologic evidences of the disease, and their rapidly fatal course. In these respects I have been unable to find anything approaching their counterpart except in two brief British reports, referring to the same industry as here described—the manufacture of scouring powder for domestic use. Lennane1mentions such a factory, in which, with only fifteen employees, there were six or seven deaths in two years. The other report is by MacDonald,Piggot and Gilder,2and I am informed by Dr. E. L. Middleton, British inspector of factories, that they refer to the same cases as does Lennane. They describe two of the workers in this factory. The one, a girl aged 17, developed cough after about twenty-nine months of exposure to the dust; she worked another four months and