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23 C. M. Connelly and F. Brink, Rev. Sci. Instruments, August, 1953. 



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30 I. Greenwood, J. Holdam and D. MacRae, Electronic Instruments, p. 94, New York (1948). 



31 M. Beznak, Acta Chem. Scand., 2 (1948) 333. 



32 H. Theorell, Biochem. Z., 268 (1934) 55. 



33 T. BiJCHER AND J. Kaspers, Biochim. Biophys. Acta, i (1947) 21. 



Received May 29, 1953 



