Social Scientist Monthly Journal of the Indian School of Social Sciences VOLUME 5 NOVEMBER NUMBER 4 1976 CONTENTS P M V Srinivasan 3 Origin of Life on Earth Francois Houtart 30 Buddhism and Politics in South- east Asia^ Part Two A V Balu 46 Marxian Political Economy Part Seven NOTE A run Prokas Chatterjee 58 Constitutional Changes: Problems and Prospects COMMUNICATION Amiya K Bagchi Barani De Amalendu Guha 80 Mao Tse-tung's Contribution to Theory and Tactics of Revolution Asok Sen BOOK REVIEW Anil Rai 82 Economic Feasibility of an Asian Common Market Articles, note, communication and book review express the views of the authors and not necessarily of the editors or of the Indian School of Social Sciences.