Received for publication June 17, 1969. Approved by the Director of the New York State Agricultural Experiment Station for publication as Journal Paper No. 1715. Part of a dissertation submitted by the author in partial fulfillment of the requirements for the Ph.D. degree, Cornell University.
The editorial assistance of Miss Charlotte Pratt and the advice and encouragement of Dr. J. Einset are gratefully acknowledged.
Present address: Western Washington Research and Extension Center, Puyallup, Washington, 98371.
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