The possibility of extending the concept of iso-spin to leptons produced in the lepton reactionsthe K-meson decays (KIJ.2, KIJ.3 and K 83 decays), pion decays, muon decays, /3-decays, and nuclear capture of muon-is investigated. If we assign the iso-spin one half for muons and electrons, and zero for the neutrinos produced in the KIJ.2 decays, WP. can find out a suitable selection rule which allows all the well established lepton. reactions and forbids all the unwanted ones. This method is applied to the K-meson decays in which the lepton reactions coexist with the boson-boson decays ('l"-73rr, IJ-72rr).* The iso-spin formalism was first applied to the lepton reactions by M. Cini and A. Gamba.2l The -similar line of investigation has recently been tried in Japan.3l But their schemes have defects more or less inconsistent with experiments. Cf. section 4 and references (2) and (3).
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