I would like to extend many thanks to the following people for their generous assistance:
Robert Pryor and Nancy Stealey for their corrections, which resulted in my making a revision on July 29, 1990.
Juan Bulnes for his helpful suggestions.
My English teacher, Ann Klein, for her thorough and fine editing, and her great patience in reviewing the draft so many times.
Laurie Cummins for her suggestions with final editing.
Emilie Yih for the inputting and preparation for printing.