My gratitude t:o Professors Masaharu Yoshimura, Hyoe Ishikawa, David H. Spodick, M. Hirai, for helpful guidance; Drs. Nadeem Khawar, Nasir Saeed, Saadat A. Khan, Arshad P. Lateef, Muhammad Afzal and Roomana Pervez for assistance in the study; Mr. Nasir ud Din Mohmand for art work, Mrs. Shabnam Ilyas for desktop publishing and Mr. Muntazim Shah for script work.