Clinical Aspects Recently work has been done in collaboration with C.-B. Laurell and S. Winblad on conditions which are characterized by a narrow-banded hypergammaglobulinemia. Fig. 1 shows the difference between this type of gamma globulin increase, called the M-type by Riva (M for myeloma or macroglobulinwemia), and the broad-banded type. The upper of the two strips marked "sisters" represents the narrow, and the lower represents the broad-banded type. "Cirrhosis +ca" at the bottom shows both narrow and broad-banded gamma globulin. The narrow band will be discussed later. The broad band is chiefly found in conditions where