If an "$f$-interaction" is introduced into the Hamiltonian for two protons, the square well of width $\frac{e^2}{m{c}^2}$ representing the specific nuclear proton-proton interaction at low energies must be modified to compensate for the effect of the "$f$-interaction." It is found that the experimental dependence of phase shift on energy for low energy proton-proton $S$-scattering would require the assumption of different well depths for different energies of the incident protons. The necessary changes in the potential would be sufficiently large to destroy the symmetry between the specific nuclear proton-proton and proton-neutron ${}_{}{}^1{}_{}{}^{}S$ interactions.

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