  In order to settle the fundamental question whether the nuclear forces
involve the long range components, the S-wave amplitude of the proton-proton
scattering is analysed in search for the extra singularity at $\nu=0$, which
corresponds to the long range force. To facilitate the search, a function,
which is free from the singularities in the neighborhood of $\nu=0$ when all
the interactions are short range, is constructed. The calculation of such a
function from the phase shift data reveals a sharp cusp at $\nu=0$ in
contradiction to the meson theory of the nuclear force. The type of the extra
singularity at $\nu=0$ is close to what is expected in the case of the strong
van der Waals interaction. Physical meanings of the long range force in the
nuclear force are discussed.
  Low energy p-p experiments to confirm directly the strong long range
interaction are also proposed, in which the characteristic interference patten
of the Coulonb and the Van der Waals forces is predicted.
