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Aug., 1940 PROPERTIES OF MONOETHANOLAMINE 1943 perature the percentage retained in the crystal as KMn*04 has risen to about 50%. A rapid interchange of a 3d electron occursbetween Mn04= and Mn04ions. 5. In the case of +5 phosphorus molecules and ions the recoils seem. to eject oxidized oxygen leaving +3 phosphorus about half of the time.The retention of activity is near joyo under all conditions.Both +3 and f 5 arsenic appear to expel -2 divalent oxygen. The retention is nearly l OOyo under all conditions.

Dawson for his help and constructive criticism in preparing the material for publication. Summary 1. A method is described for the preparation of the enzyme, lacease, from the wild mushroom, Russula foetens. A typical preparation has a Q0, of 3000.2. A measurement of units using hydroquinone as the substrate is outlined. Common plant oxidases do not appear to interfere in this procedure.3. The unusual stability of the lacease preparations over a wide pH range is demonstrated.4. The optimum pH for measurement of lacease activity is shown to be in the vicinity of pH 6.0.5. The enzymatic oxidation of hydroquinone, J>-phenylenediamine, catechol, dimethylcatechol, and potassium ferrocyanide has been described.6. The behavior of the lacease preparations is contrasted when possible with tyrosinase (campestris]).7. The importance of substrate concentration in studying the behavior of the enzyme has been emphasized.New York, N. Y.

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