1. Davis, B. L., and Adams, L. H., J. Geophys. Res., 70, 433 (1965).
2. Bell, P. M., and England, J. L., Ann. Rep. of the Director of the Geophys. Lab., Carnegie Institution, Washington, D.C., 63, 176 (1964).
3. Wyllie, P. J., and Tuttle, O. F., J. Petrol., 1, 1 (1960).
4. Wyllie, P. J., and Raynor, E. J., Amer. Min., 50, 2077 (1965).
5. Boettcher, A. L., and Wyllie, P. J., Trans. Amer. Geophys. Union (in the press) (1967).