Received for publication March 23, 1978. Approved for publication as Technical Article No. TA 1411 of the Texas Agricultural Experiment Station, College Station. Research supported by U.S. Department of Agriculture Cooperative Agreement No. 12-14-100-10,44 (34).
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Research in partial fulfillment of the requirements for the PhD degree.
Post Doctoral Fellow on leave from University of Natal, South Africa.
Authors express appreciation to Dr. Page W. Morgan for advice and criticism throughout the study.
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