“…cells (Braunsteiner, Egghart, and Potuzhek, 1960) or antinuclear factor. The rheumatoid factor, which is an auto-antibody to y-globulin, is often present with or without clinical evidence of rheumatoid arthritis, and rheumatoid arthritis may supervene after the onset of diffuse fibrosing alveolitis (Lee and Brain, 1962); contrary to Scadding's approach (1960), we would not necessarily exclude cases from the group on the basis of their having rheumatoid arthritis or a positive serological test for rheumatoid factor. Erythrocyte autoantibodies, antithyro-globulin, and anticytoplasmic antibodies were demonstrable in our two index cases.…”