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Abstract
A serum containing an M-component of IgM type gave on immunoelectrophoresis a biarcuate precipitation line. The anodal arch was produced by subunits of IgM, the other, by polymeric (17 S) IgM. The subunits combined in other optimal proportions with anti IgM than polymeric IgM as shown by e.g. immunoelectrophoresis and antigen-antibody crossed electrophoresis. Changes in immunoprecipitation patterns after reduction with mercaptoethanol of the cathodal arch to a mobility more equal to the anodal arch is one way to trace IgM subunits in plasma.