1. Laboratory of Biorheology, Polytechnic Institute of New York, Brooklyn, N.Y. 11201 and Departments of Medicine and Pharmacology, New York Medical College, New York, N. Y. 10029
2. Laboratory of Hemorheology, College of Physicians and Surgeons, Columbia University, New York, N.Y.
3. Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, N.Y. 10027
4. Department of Chemical Engineering and Chemistry, New Jersey Institute of Technology (Formerly Newark College of Engineering), Newark, New Jersey 07102