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Preface
This book is a long-delayed product of a series of lectures that I gave in June, 1956 at a conference at Wabash College directed by John Van Sickle and Benjamin Rogge and sponsored by the Volker Foundation. In subsequent years, I have given similar lectures at Volker conferences directed by Arthur Kemp, at Claremont College, directed by Clarence Philbrook, at the University of North Carolina, and directed by Richard Leftwich, at Oklahoma State University. In each case I covered the contents of the first two chapters of this book, dealing with principles, and then applied the principles to a varied set of special problems.
I am indebted to the directors of these conferences not only for inviting me to give the lectures, but even more for their criticisms and comments on them and for friendly pressure to write them up in tentative form, and to Richard Cornuelle, Kenneth Templeton, and Ivan Bierly of the Volker Foundation who were responsible for arranging the conferences. I am indebted also to the participants who, by their incisive probing and deep interest in the issues, and unquenchable intellectual enthusiasm, forced me to rethink many points and to correct many errors. This series of conferences stands out as among the most stimulating intellectual experiences of my life. Needless to say, there is probably not one of the directors of the conferences or participants in them who agrees with everything in this book. But I trust they will not be unwilling to assume some of the responsibility for it.

 
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