1. No attempt is made here at a comprehensive bibliography. Details and references concerning most of this paper may be found in T. D. Lee and C. S. Wu, Ann. Rev. Nuc. Sci. 15, 381 (1965).
2. S. Weinberg, Phys. Rev. 112, 1375 (1958).
3. For a detailed review see R. J. Blinstoyle, Proceedings, Topical Conference on Weak Interactions, p. 495 (CERN, 1969 ). For a discussion of radiative correction uncertainties see E. S. Abers, D. A. Dicus, R. E. Norton, and H. R. Quinn, Phys. Rev. 167, 1461 (1968). Also B. Beg et al, Phys. Rev. Letters 23, 270 (1969).
4. This assumes F(q2) approaches a constant as q2/→ ∞. A still weaker assumption would be F(q2)/q2 → 0 as q2.4→∞. I am grate- ful to Dr. Pagels for comments on this point. weaker assumption would be F(q2)/q2 0 as qz.4–∞. I am grate- ful to Dr. Pagels for comments on this point.
5. H. Pagels, Phys. Rev. 179, 1337 (1969), and to be published.