VI PREFACE 



I wish to thank Dr. Gerald Kerkut for proposing this book, 

 and the pubUshers for their care in its reaUzation. Emogean 

 Saunders Tartar, my wife, prepared the manuscript. My own 

 studies have been generously supported by the American Cancer 

 Society and, currently, by our National Institutes of Health. 



Vance Tartar 

 Aquaterre 



Nahcotta, Washington 

 U.S.A. 



