Corrigendum A.M. DE B R U Y N and F. KLEIN, The validity of the radial immunodiffusion method for the quantitative determination of human IgM. Evaluation of a modified method. J. Immunol. Methods 1 1 , 3 1 1 - - 3 2 0 . Page 317, line 14: 'the slopes of the regression lines are very different' should read: 'the slope of the regression line is very different from one'.
Erratum S.S. STONE, M.T. JENSEN, L.J. KEMENY and L. WILTSEY, Chromatographic separation of gram quantities of immunoglobulins from porcine colostrum against transmissable gastroenteritis virus. J. Immunol. Methods 11,333--343.