1. U. S. Army Tropical Research Medical Center and the Department of Medicine, University of Puerto Rico.
2. U. S. Army Tropical Research Medical Laboratory, APO 851, New York, N. Y.
3. Present address: Department of Metabolism, Wadsworth V. A. Hospital, Los Angeles, Calif.
4. Dept. of Medicine, University of Puerto Rico School of Medicine.
5. U. S. Army Tropical Research Medical Laboratory.