1. HOGAN, M. J., KIMURA, S. j., and O'CONNOR, G. R. (1965) Trans. ophthal. Soc. U.K., 85, 39 HOWARD, G. M., and ELLSWORTH, R. M. (1966) Amer. J. Ophthal., 62, 243
2. PERKINS, E. S. (1966) Ibid., 50, I69 SCHOFIELD, P. B. (1960) Ibid., 44, 35
3. Trans;WILDER, H.C.;Amer. Acad. Ophthal. Otolaryng,1950