. Public health papers and reports presented at the ... annual meeting of the American Public Health licting results may beinterpreted differently by those familiar with the facts, but so far as Iam able to understand the subject, the existing knowledge of the flagellaof motile bacteria and their use as diagnostic characters can be summa-rized in a few somewhat general statements. 1. The methods for demonstrating the flagella are not developed tothat state of perfection where the same results are ordinarily obtained bydifferent workers in studying the flagella on bacteria from cu
. Public health papers and reports presented at the ... annual meeting of the American Public Health licting results may beinterpreted differently by those familiar with the facts, but so far as Iam able to understand the subject, the existing knowledge of the flagellaof motile bacteria and their use as diagnostic characters can be summa-rized in a few somewhat general statements. 1. The methods for demonstrating the flagella are not developed tothat state of perfection where the same results are ordinarily obtained bydifferent workers in studying the flagella on bacteria from cultures of thesame species. There are, however, several methods by which very goodresults have been obtained, and by which it is highly probable the fla-gella on all of the motile bacteria can be demonstrated more or lessperfectly. 2. The nature of the flagella or flagella producing substance has notbeen positively determined. The results recorded indicate that they arecomposed of a plasma which surrounds the organism, and which undercertain conditions differentiates itself wholly or in part into these long or. NATURE AND VALUE OF THE FLAGELLA. 441 shortened filaments. Whether this capsular substance splits up into theclearly defined flagella, or whether the filaments are produced by a grad-ual growth or by a process resembling that in the production of pseudo-podia has not been determined. It is highly probable that the flagellaare structureless and composed of different substance, as indicated by itsreaction in staining reagents, than that part of the organism detected bythe ordinary stains. 3. The flagella of closely related bacteria such as Bacillus cholerasuis, B. coli communis, and B. typhosus resemble each other so closelythat they can not be cousidered as specific characters. There are, how-ever, marked variations observed in certain preparations, but these differ-ences are as great between different preparations of the same species asbetween those of different species,
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