Printed in Great Britain 367 Complex Flagellar Phases in Salmonella

Salmonella cultures in which loss of a major antigenic component re-sulted in the formation of stable serotypes of simpler constitution, pre-viously were thought to have lost a third flagellar phase. Further study of cultures of Salmonella hamiltan, S. worthington, and S. meleagridis of complex constitution indicated that loss of a third phase was not involved but that instead the organisms lost a major antigenic constituent present in both phases of diphasic types and in the single flagellar phase of monophasic types. Attention was drawn to the similarity of their behaviour to that of S. salinatis, S. montgomery, and certain other salmonellae of complex constitution