1. Bonner, J., ‘Plant Biochemistry’ (Academic Press, New York, 1950).
2. Davies, D. D., Exp. Bot., 7, 203 (1956).
3. Rautanen, N., and Tager, J. M., Ann. Acad. Sci. Fenn., A, II, 60, 241 (1955).
4. Bone, D. H., Plant Physiol., 34, 171 (1959).
5. Millerd, A., and Bonner, J., Arch. Biochem. Biophys., 49, 343 (1954).