1918] 
BONNS—ETHERIZATION AND ENZYME ACTIVITY 289 
library of the Missouri Botanieal Garden; to Dr. B. M. 
Duggar, under whose direction the work was carried out, for 
interest and kindly criticism and advice; to the Department 
of Biological Chemistry and the Medical School of Washing- 
ton University for laboratory facilities, and to Dr. S. M. 
Zeller, Visiting Fellow in the Henry Shaw School of Botany, 
for helpful assistance in the catalase determinations.  Ac- 
knowledgment is also due Mr. J. Christian Bay, of the John 
Crerar Library, Chieago, for a careful translation and ab- 
straet of the Danish paper by Johannsen. 
Graduate Laboratory, Missouri Botanical Garden. 
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