1. Bonner, J. T., Morphogenesis (Princeton Univ. Press, 1952).
2. Lev, M., Nature, 173, 501 (1954).
3. Jennings, J., Nature, 190, 190 (1961).
4. Runyon, E. H., Collecting Net, 17, 88 (1942). Sussman, M., and Lee, F., Proc. Nat. Acad. Sci., 41, 70 (1955).
5. See Bonner, J. T., The Cellular Slime Molds (Princeton Univ. Press, 1959).