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The writer wishes to express her appreciation to Dr. E. C. Stakman, of the Division of Plant Pathology and Botany, and to Dr. A. T. Henrici and Dr. C. E. Skinner, of the Division of Bacteriology, for their interest and helpful suggestions. She also is indebted to Dr. Samuel Eddy, of the Division of Zoology, for the identification of the hard shell crab.
1
Paper No. 1053 of the Journal Series of the Minnesota Agricultural Experiment Station. Coöperative investigations between the Division of Plant Pathology and Botany, of the Department of Agriculture, and the Department of Bacteriology, of the Medical School, of the University of Minnesota.