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STUDIES ON MUTABILE TYPE VARIATION (MURASE) WITH SPECIAL REFERENCE TO INFLUENCE OF GALACTOSE ON THE VARIANTS DAIZO USHIBA and BUJIRO KITASATO Department of Bacteriology,. School of Medicine Keio University (Received on Dec. 2, 1952) Since Murase(1) reported a particular colonial variation of E. coli named "mutabile type" by him, many investigations on this phenomenon have been car ried out in our laboratory which were once summarized by Kobayashi(2) in 1940. Extensive studies after that have revealed, however, that this variation has an intimate connection with some bacterial metabolism specifically influenced by galactose, and that, although the name, "mutabile type", was first introduced by the resemblance of colonial appearance of variants to that of B. coli mutabile of Massini(3), this variation should be differentiated from the latter. It is also ap