Certain yeasts can ferment galactose by the formation of an adaptive 'galactozymase' when placed in aqueous solutions of galactose and in the apparent absence of cell division (Stephenson & Yudkin, 1936; Spiegelman, 1945). Thoughmuchworkhasbeen done on the mechanism of this adaptation (Spiegelman, 1947) little knowledge has so far been obtained concerning the actual enzymic changes involved or of the intermediates formed.
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J. F. Wilkinson (1949) studied this question.
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