The Paradigm Concept: The Structure of Scientific Revolutions. Thomas S. Kuhn. Second edition. University of Chicago Press, Chicago, 1970. xii, 210 pp. Cloth, $6; paper, $1.50. International Encyclopedia of Unified Science, vol. 2, No. 2.; Criticism and the Growth of Knowledge. Proceedings of the International Colloquium on the Philosophy of Science, London, July 1965, vol. 4. Imre Lakatos and Alan Musgrave, Eds. Cambridge University Press, New York, 1970. viii, 282 pp. Cloth, $11.50; paper, $3.45.