Abstract
A double precipitation from Liebig''s beef extract yielded an activator for the phosphatase found in the kidney. The precipitants were Ba(OH)2 and Pb acetate. The activator was freely dialyzable. The less carbohydrate and protein it contained the more active it was. The purified activator contained large amounts of sulphate and Mg, but was not identified as MgSO4. Dialyzed ash from the kidney itself did not yield a phosphatase activator.

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