1. See review byStowe andYamaki: Ann. Rev. Plant Physiol.8, 181 (1957).
2. Brain andHemming: Physiol. Plantarum [Copenh.]8, 699 (1955) and earlier papers.
3. Phinney, West, Ritzel andNeely: Proc. Nat. Acad. Sci. U.S.A.43, 398 (1957).
4. Cross, Grove, MacMillan andMulholland: Chem. and Ind.1956, 954.
5. Cross, Grove, MacMillan andMulholland: Symposium Lecture, 132nd Meeting Amer. Chem. Soc. New York, Sept., 1957;Grove, Jeffs andMulholland: J. Chem. Soc. [London] (in the press).