STUDIES IN BACTERIOSIS. X

Abstract
Summary.: Serum agglutination has been used in order to determine possible relationship with Bacillus lathyri of certain yellow organisms which occur in the tissues of plants infected by that organism. One of these gave all the reactions of Pseudomonas Phaseoli. Pseudomonas Phaseoli and Bacillus lathyri gave distinct cultural characters, and these were retained even after the two organisms had been “trained” by ten transfers through the same medium. The two organisms seem to be susceptible to group agglutination, Bacillus lathyri being agglutinated with the serum of Pseudomonas Phaseoli. Intermediate forms between these two organisms are found which agglutinate equally with the sera of both species. The suggestion is made that one species may have arisen in the tissues of the plant as a mutant from the other. Aplanobacter dissimulans, another organism often associated with Bacillus lathyri, appears to bear no sort of relationship with the latter. Aplanobacter michiganense failed to produce an agglutinating serum on inoculation into a rabbit.

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