173 



R. P. Levine 



46. Henninger, M. D. , and Crane, F. L. , Plant Physiol. , ^, supplement, 

 p. XI (1963). 



47. Krogman, D. W. , Biochem. Biophys. Res. Commun. , 4, 275(1961). 



48. Arnon, D. I., Whatley, F. R. , and Horton, A. A., Federation Proc. , 

 21, 91 (1961). 



