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1Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, New York
3
Present address: Department of Horticulture, Michigan State University, East Lansing, Michigan.
1
Received Sept. 30, 1963.
2
Supported by the United States Atomic Energy Commission Contract AT (30-1)-2598. Taken from the Ph.D. thesis of R. A. Mecklenburg, Cornell University, 1964.