Second Threshold in Weak Interactions

The point of view that weak interactions must have a second threshold below 300--600 GeV is developed. Above this threshold new physics must come in. This new physics may be the Higgs system, or some other nonperturbative system possibly having some similarities to the Higgs system. The limit of large Higgs mass is thought to be relevant in this context. Radiative corrections proportional to $m^2$ and $\ln m^2$, $m$ being the Higgs mass, are calculated. Contemplation of the theory in the limit of large Higgs mass suggests that the ``new physics'' may contain breakdown of $\mu$--$\bf e$ universality and other than V--A neutrino interactions already at relatively low energies.