1. ABELSDORF, G., aDd WESSELY, K. (1909). Arch. Augenheilk., 64, Erglinzungsheft, p. 65.
2. Foundation;BARANY, E.H.,1956
3. BERGGREN, L., and VRABEC, F. (1957). Amer. J. Ophthal. In the press.
4. CANNON, M. R., and FENSKE, M. R. (1938). Industr. Engng Chem. (Anal. Ed.), 10, 297.
5. VRABEC, F. (1957). Amer. J. Ophthal. In the press.