1. Andresen, N., and B. M. Pollock, 1952: C. r. Lab. Carlsberg (Ser. Chim.)28, 247.
2. Bahr, G. F., 1954: Exper. Cell Res.7, 457.
3. Bath, Jean D., unpublished.
4. Bonner, J. T.: The Cellular Slime Molds, pp. 25?54 Princeton University Press, Princeton, 1959.
5. Brandt, W., and G. D. Pappas, 1959: J. Biophys. Biochem. Cytol.6, 91.