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A new theory of the stable transition of a superconductor between normal and superconducting states is reviewed and data supporting this theory are presented. Data on copper‐clad Nb‐40% Ti are presented, and the slope for the variation of the critical current with wire diameter is found to be 1.5 for wire diameters between 0.005 and 0.05 cm. For copper‐clad samples of this material, voltage‐current data agree remarkably well with the new theory of stabilization. The importance of the superconducting transitional region is emphasized.