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Mutating strains of paratyphoidbacilli are mentioned several times, especially by Baerthlein who has described different forms of colonies and variants in respect to the size of the bacilli. Recently a mutating form was described by Fletcher who found that the stool of a carrier who was examined at regular intervals suddenly became almost free of the typical colonies of paratyphoidbacilli. Simultaneously he found a new form of bacillus that he had not been aware of before. This microbe formed large wet colonies on the agar and did not agglutinate in a paratyphoidserum. Fletcher considered the microbe a mutating form of paratyphoid and called it mucoid on account of its wet mucuslike consistency. With the exception of Fletcher the earlier authors on the subject of transmutation in paratyphoidbacilli do not seem to have observed many alterations as to the agglutination in mutating bacilli, and in the case of Fletcher this author does not bring forth any explanation of the lack of agglutinability. We have therefore thought it worth while to present an account of a paratyphoid strain, that we have watched while mutating and made the object of a fairly minute examination. This strain was isolated from the urine of a man whose record of sickness is as follows:

A MUTATING, MUCOID PARATYPHOIDBACILLUS ISOLATED FROM THE URINE OF A CARRIER