1. Cole, K. S., and Curtis, H. J., Cold Spring Harbor Symposia on Quantitative Biology, 4, 73 (1936).
2. Curtis, H. J., and Cole, K. S., J. Gen. Physiol., 21, 189 (1937).
3. Curtis, H. J., and Cole, K. S., J. Gen. Physiol., July 20, 1938.
4. Cole, K. S., and Curtis, H. J., J. Gen Physiol., to appear September 20, 1938.
5. To be submitted to J. Gen. Physiol.