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3. CATFORD, G. V. (1966) Trans. ophthal. Soc. U.K., 86, I9 COSTENBADER, F. D., and ALBERT, D. G. (1958) A.M.A. Arch. Ophthal., 59, 607 EASTERLY, H. D., NADBATH, R. P., and RUSSELL, J. c. (1960) Ibid., 63, 997
4. FOLK, E. R. (1957) Ibid., 57, 39 GIRARD, L. J. (1956) Sth. med. J., 4g, 342
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