wrote this book. But, it would never have appeared had I not
received help from teachers and others over the years. Let
me acknowledge their help, while not suggesting that they
are at all responsible for whatever errors, in fact or in judgment,
may occur in this book.
First, the teachers. Professor Lora Bond of Drury College in￾spired me, Professor Richard A.Goff of the University of Okla￾homa encouraged me, Professor Nelson T. Spratt, Jr., of the
University of Minnesota helped me, and Dr. Thomas J. King of
the National Cancer Institute, instructed me