The Vitamin Requirements of Leuconostoc for Dextran Synthesis.

AND LILLIAN K. SCHNEIDER..................................... 181 The Consequences of Mutation during the Growth of Biochemical Mutants of Escherichia coli. III. The Inhibition of Histidine-independent Bacteria by Histidineless I3acteria in Aerated Cultures. FRANCIS ,J. RYAN AND LILLIAN K. SCHUCHARDT ................................... 191 The Consequences of Mutation during the Growth of Biochemical Mutants of Escherichia coli. IV. The Mechanism of Inhibition of Histidine-independent Bacteria by Histidineless Bacteria. FRANCIS J. RYAN AND LILLIAN K. SCHNEIDER ......................................... 201 Studies on the Aspartic Acid Decarboxylase of Rhizobium trifolii. DANIEL BILLEN AND HERMAN C. LICHSTEIN ................. ........... 215 Growth Inhibition of Tubercle Bacilli by Analogues of Phenylalanine.