PREFACE xi 



Grant C-2730); and by the John Simon Guggenheim Memorial 

 Foundation. 



Finally, the author is deeply indebted to the Union Carbide 

 Research Institute and the Union Carbide Corporation for their 

 generosity in seeing the manuscript through its gestation period, 

 and to Mrs. J. Hess, Miss M. Wood, Mrs. F. Bouchard, Mrs. 

 B. Clark and Miss G. Plock for their patience and cheerful efforts 

 that guaranteed its safe delivery. 



If there are controversial ideas in this monograph, the author 

 is pleased to assume in full the responsibility for their presence 

 and vigorous exposition. 



