1. The total lipid was extracted from Staphylococcus lactis I3 with chloroform-methanol mixtures and the glycolipid component was isolated by chromatography on silicic acid. 2. Saponification yielded a non-crystalline glycoside for which the structure O-beta-d-glucopyranosyl-(1-->6)-O-beta-d-glucopyranosyl-(1-->1)-d-glycerol has been established by chemical degradations and by comparison with synthetic material. 3. The role of the glycosyl diglycerides in bacterial membranes is discussed.
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