ACKNOWLEDGMENTS 



Much of the preliminary work on this paper was carried out 

 while the author was attending the Scripps Institution of 

 Oceanography under the training program of the U. S. Naval 

 Oceanographic Office. Sincerest thanks are due Dr. Carl L 

 Hubbs of Scripps for his encouragement and critical review of 

 the original manuscript. Thanks are due also to Kenneth W. 

 Kaye, William T. Leapley, and Charles R. Coleman of the U. S. 

 Naval Oceanographic Office for reviewing the final draft. 



