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1DEPARTMENT OF BOTANY, STATE COLLEGE OF WASHINGTON, PULLMAN, WASHINGTON
3
To be submitted as partial fulfillment of the requirements for the degree of Doctor of Philosophy.
1
Received revised manuscript May 14, 1957.
2
This investigation was carried out under U. S. Atomic Energy Commission, Division of Biology and Medicine, Contract No. AT (45-1)-213. Presented at the Seattle meeting of the A.A.A.S., June 12, 1956.