  Double meson production of the eta and pion at the threshold region is
investigated in order to determine chiral property of the nucleon.
  The eta can be used as a probe for the negative parity nucleon $N^* \equiv
N^*(1535)$ produced in the intermediate state.
  The coupling of the low energy pion in the final state is then used to
extract the sign of the Yukawa coupling, $\gpRR$, which distinguishes the two
realizations of chiral symmetry, either naive or mirror, for the nucleon.
