PREFACE 



the subject chosen for discussion. The first reaction is 

 spontaneous, and is so well recognized by everyone as to 

 require no further elaboration. In marshaling my confi- 

 dences to present this material, I am reinforced by some 

 of the thoughts laid before me in my graduate study by 

 Professor Roger J. Williams, to whom these lectures are ded- 

 icated, plus the sound, carefully fabricated experimental 

 work by many of my colleagues over a period of fifteen 

 years. Among these are Drs. Tsoo E. King, Chih H. Wang, 

 and R. W. Newburgh, to mention only three, and also 

 many former graduate students who have contributed to 

 the over-all knowledge about the problem, especially Drs. 

 Jens G. Hauge, Paul A. Kitos, and Joseph T. Cummins. 

 To these persons, and others of our group, I am deeply 

 grateful. 



V. H. Cheldelin 

 August, 1961 



