One of the simplest problems about the reaction of radiation field on the electron is the radiative correction for the elastic scattering cross section of an electron by a fixed electrostatic potential. But attemr-ts to solve this problem have heretofore been beset by divergence difficulties. Recently, however, a certain part of the divergent corrections was found to be just cancelled if the C-meson field is introduced in addition to the radiation field. (1)(2) At the same· time it became clear that the divergences can be attributed to the self~energy and vacuum polarization; so that immediately after that subtraction or amalgamation was proposed in order to obtain a finite result. (~) Chr01zolol.;·ica1t.y, the C-meson hypothesis was thus put forward first and then the self-consistent subtraction method was presented as an alternative prescription. Blit through further considerations we have now the following opinion with regard to the logical relation of these two hypotheses: The self-consistent subtraction method analyses in what· manner the divergences occur and finds that they are reduced to unobservable renormalizatiol1 of mass and charge and that one can obtain a finite reactive correction by merely replacing the theoretical infinite mass and charge by the empirical ones. This conclusion has been indeed verified· by several experiments, bllt the fundamental difficulty of divergence remains still unsolved. The Cmeson hypothesis, on the other hand, gives a tentative solution as to the origin of one of these divergences. Thus it aims at a higher substantial stage of the theory and seems at the S:'lme time unevitably less confirmative before it obtains an experimental support. Another remark is that the
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