1. Hamilton, W. F., in Fulton, J., “Textbook of Physiology” (16th edit., Saunders, New York, 1949).
2. Clark, J. K., and Barker, H. G., Fed. Proc., 8, 26 (1949).
3. Smith, H. W., “The Kidney, Its Structure and Function in Health and Disease” (Oxf. Univ. Press, 1951).
4. Ward, A. A., jun., and McCulloch, W. S., J. Neurophysiol., 10, 309 (1947).
5. Green, H. D., and Hoff, E. C., Amer. J. Physiol., 118, 641 (1937).