6. Parity Non-Conservation and 8-Decay. This is undoubtedly the most significant section of the book. The papers in this session review the recent parity experiments and reflect on their meaning. This is probably the first time that such a comprehensive survey of this area has appeared in print. The outstanding papers are on the theoretical implications of parity non-conservation (T. D. Lee), the experimental evidence for parity non-conservation (C. S. Wu), the effects of the recent developments on the interpretation of old β-decay data (E. J.