1. Blood Research Laboratory, New England Medical Center Hospitals, and the Department of Medicine, Tufts University School of Medicine, Boston, Massachusetts.
2. Boston Floating Hospital, New England Medical Center Hospitals; Instructor in Medicine, Tufts University School of Medicine.
3. Freedman's Hospital, Washington, D. C.; formerly Trainee in Hematology under Graduate Training Grant #AM 5210-04, Blood Research Laboratory, New England Medical Center Hospitals.
4. U. S. A., Fort Sans Houston, Texas; formerly Trainee in Hematology under USPHS Graduate Training Grant *AM 5210-04, Blood Research Laboratory, New England Medical Center HospitaLs.
5. New England Medical Center Hospitals.