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1Department of Botany, University of California, Berkeley 4
3
Present address: Department of Biology, Wellesley College, Mass.
1
Received May 6, 1963.
2
Most of the research reported in this paper is part of a dissertation submitted by the first author to the Graduate Division of the University of California at Berkeley in partial satisfaction of the requirements for the degree of Doctor of Philosophy in the field of Plant Physiology. The work was supported by research grant G-7031 from the National Science Foundation.