Abstract
Summary
By growth in serums it was possible to change S. Simsbury (I,III,-XIX:z27) S. Simsbury to S. senftenberg(I,III, XIX:g,s,t) and viceversa. The 
change was accomplished without difficulty but the reverse was done only by first transforming the H antigens to a hitherto unrecognized form (Z34) and then changing them to Z27. It is recommended that S. Simsbury be dropped from the classification and that the formula of S. senftenberg be written 
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