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In Vol. 53, No. 1, January 1, 1931, page 93, eighth line under the heading "Experimental," for "may be defined as the smallest amount of antiserum," read "may be defined as ten times the smallest amount of antiserum."

ON THE PRESENCE IN ANTIPNEUMOCOCCUS SERUM OF TYPE-SPECIFIC PROTECTIVE ANTIBODY NOT NEUTRALIZED BY HOMOLOGOUS SPECIFIC SOLUBLE SUBSTANCE