SUMMARY: Antisera, prepared against ‘smooth’ variants of the Flexner, Boyd and Sonne types of , were investigated for their agglutinin and precipitin content. The precipitation reactions, employing formamide extracts of the organisms, showed a marked degree of specificity which was lacking in the agglutianation reactions except with the Boyd and Sonne types. Cross-precipitation reactions occurred with Boyd's Flexner IV (103) and Flexner Y and also with Boyd's Flexner V(P110) and Flexner X. Absorption tests, however, revealed each of these four organisms to have a predominant specific precipitinogen.


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