A survey of the weak interactions.- Semileptonic decays.- Non leptonic decays.- Current algebra and weak interactions.- The decay of the K0-¯K0 system.- Questions raised by CP-nonconservation.- Relations for semileptonic weak interactions involving photons.- Radiative corrections to weak decays involving leptons.- Radiative corrections to weak interactions.- Unconventional models of weak interactions.- Weak interactions at small distances.- Physical symmetries in the framework of quantum field theory.