This book reproduces the papers collected from the proceedings of a symposium organized in honor of Victor Weisskopf in 1974 at MIT. The papers merit attention because of their historic significance. Particle physics was at a crucial transition point at the emergence of the Standard Model owing to experiments that point to the existence of quarks. The contributors in this book include Hans Bethe, Julian Schwinger, Edward Purcell, T D Lee, Murray Gell-Mann, Ben Mottelson, Max Delbr ck and other renowned scientists. The book also contains a commentary by K Huang.