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1Department of Agricultural and Biological Chemistry, Pennsylvania State College.
1
Published by permission of the Director of the Agricultural Experiment Station as scientific paper no. 433.
2
This investigation was conducted in cooperation with Dr. W. W. GARNER, of the U. S. Bureau of Plant Industry, Office of Plant Nutrition and Tobacco Investigations, and Professor F. D. GARDNER, Department of Agronomy of the Pennsylvania State College.