1. For recent reviews of quantum electrodynamics see Refs. 3, 14, 22, 31; S. J. Brodsky, äThe Impact of Quantum Electrodynamics,” presented to LAMPF Users Group, Nov. 1975. For a discussion of the high-energy tests, see R. Hofstadter, Proceedings of the 1975 International Symposium on Lepton and Photon Interactions at High Energies, W. T. Kirk, ed. (SLAC, Stanford, 1975), p. 869.
2. P. T. Olsen and E. R. Williams, Atomic Masses and Fundamental Constants, 5, J. H. Sanders and A. H. Wapstra, eds. (Plenum Press, New York, 1976), p. 538.
3. For reviews see M. L. Lewis, Atomic Physics 4, G. zu Putlitz, E. W. Weber, and A. Winnacker, eds. (Plenum Press, New York, 1975), p. 105; V. W. Hughes, Atomic Physics 3, S. J. Smith and G. K. Walters, eds. (Plenum Press, New York, 1973), p. 1; N. M. Kroll, ibid., p. 33.
4. C. Schwartz, Phys. Rev. 134, A1181 (1964).
5. A. Kponou, V. W. Hughes, C. E. Johnson, S. A. Lewis, and F. M. J. Pichanick, Phys. Rev. Lett. 26, 1613 (1971); S. A. Lewis, F. M. J. Pichanick, and V. W. Hughes, Phys. Rev. A 2, 86 (1970).