1. Department of Hematology, Laboratory Division, Montefiore Hospital and Medical Center, New York, N. Y.
2. 10th Medical Laboratory and Transfusion Service, U. S. Army, Europe; formerly Research Associate, Montefilore Hospital and Medical Center, and Instructor in Medicine, Albert Einstein College of Medicine, New iork,
3. Montefilore Hospital and Medical Center, New York, N. Y.
4. Columbia University College of Physicians and Surgeons; formerly Research Fellow, Montefilore Hospital and Medical Center, New York,