ACKNOWLEDGMENTS
The author wishes to express his appreciation to those who have
helped to make this work possible. I am most appreciative of Dr. L.
W. Clem for his support in this research for his continued encourage-
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ment and suggestions. Special thanks are also extended to Dr. R. B.
Crandall, Dr. C. A. Crandall, Dr. B. Gebhardt, Dr. J. W. Shands, Jr.,
Dr. P. A. Small, and other members of the department for their assistance
throughout this work.
A very special appreciation is expressed for my mother and father
for their continued support throughout my academic career'and for my
wife for the typing of this manuscript as well as for her patience,
understanding, and love.
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