We have found an interesting dissociation phenomenon of plaque in some viral strains of Salmonella phages. This phenomenon is considered to be important at least in the following points of view. First of all it suggests a new pattern of mutation in bacterial viruses. And secondly it suggests a new possible model of gene constitution of some bacterial viruses. Besides the characteristic pattern of this phenomenon, in the present paper will also be described some speculations for the explanation of this phenomenon and the results of recombination analysis carried out in concern with these speculations. Material and Method The viruses in question are the so-called s group viruses, as follows : S. gallinarum (Akita strain) phage Xs strain .
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