  We present a chiral-invariant meson-baryon Lagrangian which describes the
interactions of the baryon octet with the lowest-mass meson nonets. The
nonlinear realization of the chiral symmetry generates pair-meson interaction
vertices. The corresponding pair-meson coupling constants can all be expressed
in terms of the meson-nucleon-nucleon pseudovector, scalar, and vector coupling
constants, and their corresponding $F/(F+D)$ ratios, and for which empirical
estimates are given. We show that it is possible to construct an NN potential
of reasonable quality satisfying these theoretical and empirical constraints.
